10 Best High Build Primers (October 2026)

Most primer failures start with a mismatch between the primer and the job. A high build primer is meant to fill sand scratches and minor surface flaws so the topcoat lays flat, but a thin aerosol on a panel with deep 80-grit scratches will not level them. A kit sized for a whole car is wasted on a single fender repair. The Best High Build Primers depend on three things: the chemistry (2K urethane, acrylic or oil-based), the amount you need to mix, and whether the surface is bare metal, old paint, filler or plastic.

The short answer: the Acme Finish 1 FP410 Quart Kit suits small shops and DIY repairs where you want a 2K urethane in a manageable volume, the Acme Finish 1 FP410 Gallon Kit suits full-panel or whole-vehicle work with the same chemistry, and the Speedokote SS-2950G Gallon Kit suits buyers who want a primer/sealer with fast dry and easy sanding. The rest of the list covers a larger Speedokote kit, a U-POL gallon with a temperature-rated hardener, two direct-to-metal quart-class kits, an acrylic primer, and two aerosols for spot repairs.

TL;DR: top picks at a glance

• Best overall: the Acme Finish 1 FP410 Quart Kit, a 2K urethane in a 40 fl oz kit with a half pint of hardener, rated for resistance to sand scratch swelling.
• Best for large projects: Acme Finish 1 FP410 Gallon Kit, the same FP410 high solids gray urethane in a 9 lb gallon kit.
• Best for fast-sanding primer/sealer: Speedokote SS-2950G Gallon Kit, a 128 fl oz high build urethane primer/sealer that dries fast and sands easily.
• Best for spot repairs: LAUCO 57062 Aerosol Surfacer, a 13 oz can that works on metal, aluminum, plastic and fiberglass.

Best High Build Primers Comparison (October 2026)

#	Product	Best for	Capacity	Type	Mix ratio
1	Acme Finish 1 FP410 Quart Kit	Small shop repairs	40 fl oz	2K urethane	Not listed
2	Acme Finish 1 FP410 Gallon Kit	Large refinish jobs	Gallon kit, 9 lb	2K urethane	Not listed
3	Speedokote SS-2950G Gallon Kit	Fast-sanding sealer	128 fl oz	2K urethane	Not listed
4	LAUCO 57062 Aerosol Surfacer	Aerosol spot repairs	13 oz	Aerosol surfacer	None (aerosol)
5	U-POL 4.2 VOC Gallon Kit	Temperature-rated hardener	1 gallon kit, 15 lb	2K urethane	4:1
6	Rust-Oleum Stops Rust Filler Primer	Rust-prone small areas	12 oz	Oil-based aerosol	None (aerosol)
7	Speedokote SS-2790G Super Fill	Heavy fill volume	160.15 fl oz	High build primer kit	Not listed
8	LiME LiNE 2K Urethane Primer	Direct-to-metal work	1.25 qt (40 fl oz)	2K urethane	4:1
9	SEM 42013 Acrylic Primer	Single-component acrylic	16 oz	Acrylic	Not listed
10	Restoration Shop DTM4200 2K Kit	Deep scratch filling	1.25 qt (32 fl oz primer)	2K urethane	4:1

1. Acme Finish 1 FP410 Quart Kit: Best 2K Urethane High Build Primer for Small Repairs

• Type: 2K high solids urethane primer, gray
• Kit size: 40 fl oz total, with a half pint of hardener
• Shipping weight: 3.95 lb
• Mix ratio: Not listed (described as simplified)
• Product line: Finish 1, which also includes surface cleaners, undercoats, acrylic enamels and clearcoats

Pros:

• The 40 fl oz kit includes a half pint of hardener, so there is no separate activator to source.
• Resistance to sand scratch swelling helps keep the sanded surface from showing scratch pattern under the topcoat.
• Simplified mix ratios reduce the chance of measuring errors for first-time 2K users.
• The Finish 1 line includes cleaners, undercoats and topcoats, so the whole job can come from one family of products.

Cons:

• The exact mix ratio is not specified, so you must follow the container instructions closely.
• Coverage and dry time are not listed, which makes planning a multi-panel job harder.
• At 40 fl oz it will run short on anything larger than a few panels.

Best for: DIY car enthusiasts and small shops repairing one to three panels who want a 2K urethane without buying a gallon.

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What sets the Acme Finish 1 FP410 Quart Kit apart is its balance. It is a real 2K urethane, which fills and sands better than a single-component can, yet the kit is small enough that a hobbyist will use it before the mixed material becomes a concern. The scratch swelling resistance is the most practical spec here, because swelling is what makes a repair look fine under primer and reveal lines after the topcoat.

Against the Restoration Shop DTM4200 2K Kit, which is also a quart-class 2K kit, the Acme kit gives you less explicit information about mix ratio and substrate adhesion. If you are priming bare metal directly, the LiME LiNE 2K Urethane Primer and the Restoration Shop kit state direct-to-metal capability, while this listing does not. Treat the Acme as a primer for prepared, previously coated or filled surfaces.

It is the wrong choice for a full-body respray. The Acme Finish 1 FP410 Gallon Kit uses the same FP410 chemistry in a much larger quantity and is the better fit there. For a single chip or small patch, one of the aerosols such as the LAUCO 57062 Aerosol Surfacer avoids mixing altogether.

2. Acme Finish 1 FP410 Gallon Kit: Best High Solids Urethane Primer for Full Refinish Jobs

• Type: 2K HS (high solids) gray urethane primer
• Kit size: Gallon kit, supplied as a 2-piece set
• Shipping weight: 9 lb
• Color: Gray
• Mix ratio: Not listed

Pros:

• The gallon kit supplies enough material for multiple panels or a complete vehicle in one purchase.
• High solids (HS) formulation is intended to lay down more film per coat than a standard primer.
• The 2-piece set pairs the primer with its hardener, so the kit arrives ready to mix.
• It shares FP410 chemistry with the quart kit, so a small test panel can be done in the smaller size first.

Cons:

• Very little detail is specified beyond the gray color, so substrate approvals and dry times are not stated.
• The hardener volume is not listed.
• A 9 lb kit is more than a one-panel repair needs, and leftover mixed primer is wasted.

Best for: Restorers and small body shops priming several panels or an entire vehicle with a gray 2K urethane.

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The Acme Finish 1 FP410 Gallon Kit is the same product as the quart kit scaled up, and that is its main argument. If the smaller kit works on your first panel, the gallon lets you keep the same primer across the whole project, which avoids color or behavior differences between batches of different products.

Compared with the Speedokote SS-2950G Gallon Kit, the Acme gives you less published detail on adhesion and sanding behavior. The Speedokote lists great adhesion, fast dry and easy sanding, and states a 128 fl oz volume, while the Acme listing reads more like a product code than a spec sheet. For buyers who care about knowing the volume of the primer in the kit, the Speedokote is clearer.

Skip it if you work on one or two small repairs, where the Acme Finish 1 FP410 Quart Kit or an aerosol will be used up rather than expiring on a shelf. For heavy filling of deeper scratches, the Restoration Shop DTM4200 2K Kit specifically cites medium to deep sand scratches.

3. Speedokote SS-2950G Gallon Kit: Best Fast-Dry Urethane Primer/Sealer for Easy Sanding

• Type: High build 2K urethane primer/sealer, gray
• Volume: 128 fl oz (one gallon)
• Kit parts: SS-2950G primer with a 2790A component
• Highlights: Great adhesion, fast dry, easy sanding
• Mix ratio: Not listed

Pros:

• The primer/sealer function means one product covers both leveling and sealing before color.
• Fast dry shortens the wait between coats and before sanding.
• Easy sanding reduces block time on large panels.
• The 128 fl oz size gives a gallon of material for multi-panel work.

Cons:

• The mix ratio and pot life are not given.
• Numeric dry and recoat times are not specified, only the description "fast dry."
• Direct-to-metal use is not stated, so bare metal may need a separate etch or epoxy step.

Best for: Hobbyists and shops that sand a lot and want a gallon-sized primer/sealer that dries quickly.

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The Speedokote SS-2950G Gallon Kit stands out for being described as both a primer and a sealer. That matters when you are laying primer over a mix of old paint, filler and fresh repair areas, because a sealing primer helps the topcoat look even across them. Fast dry and easy sanding are the two traits that save the most labor in a real workflow.

Compared to the Speedokote SS-2790G Super Fill, the SS-2950G has a smaller volume (128 fl oz against 160.15 fl oz) but a clearer description of behavior. Compared to the U-POL 4.2 VOC Gallon Kit, it does not publish a hardener temperature range, so shops working in hot or cold conditions get better guidance from U-POL.

It is the wrong choice if you need direct-to-metal confirmation. The LiME LiNE 2K Urethane Primer and the Restoration Shop DTM4200 2K Kit both say so explicitly. It is also too large for a single repair, where the Acme Finish 1 FP410 Quart Kit is more appropriate.

4. LAUCO 57062 Aerosol Surfacer: Best Heavy Fill Aerosol High Build Primer for Mixed Materials

• Type: High-build aerosol primer surfacer, grey
• Size: 13 oz can, 0.75 lb
• Substrates: Metal, aluminum, fiberglass, plastic and urethane
• Flexibility: Rated for both rigid and flexible substrates
• Topcoat compatibility: Most automotive paint refinish topcoats

Pros:

• A 13 oz can needs no mixing, so there is no hardener or pot life to manage.
• It lists adhesion on metal, aluminum, fiberglass, plastic and urethane, a wider range than most cans here.
• Use on flexible substrates means it suits bumper covers and other plastic parts.
• It is compatible with most automotive refinish topcoats.

Cons:

• A single can covers only a small area, and coverage is not listed.
• Aerosol film build will not match a 2K kit for deep scratches.
• Dry time is not specified.

Best for: Owners fixing a bumper scuff, a mirror housing or a small panel repair across mixed materials.

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The LAUCO 57062 Aerosol Surfacer is the most flexible spot-repair choice on the list because of its stated substrate range. Plastic and fiberglass are the surfaces where many primers struggle, and this one lists both, plus aluminum. For that reason it is a better fit for bumpers and trim than the Rust-Oleum Stops Rust Filler Primer, which lists wood, metal and fiberglass.

Use it where a 2K mix is unwarranted. If you are filling medium to deep scratches across a panel, the Restoration Shop DTM4200 2K Kit is the stronger choice, and anything larger belongs with the Acme Finish 1 FP410 Gallon Kit.

5. U-POL 4.2 VOC Gallon Kit: Best High Solids Urethane Primer for Controlled Cure Temperatures

• Type: HS high build urethane primer
• Kit size: 1 gallon, 2-piece set, 15 lb
• Mix ratio: 4:1
• Hardener: Standard, for 60 to 95 F
• Cure options: Air dry, low bake or I.R. cure

Pros:

• The 4:1 mix ratio is clearly stated, which makes measuring simple.
• The standard hardener is matched to a defined 60 to 95 F working range.
• It can be air dried, low baked or I.R. cured, which suits shops with a bake booth or infrared lamps.
• Excellent opacity and hiding power cover repair marks and mixed-color substrates in fewer coats.

Cons:

• The 15 lb kit is heavy and more than most hobby projects need.
• Direct-to-metal use is not stated.
• Color is not clearly specified.

Best for: Body shops that need predictable curing across a known temperature range and can use bake or infrared cure.

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The U-POL 4.2 VOC Gallon Kit is the most detailed kit on this list on cure options. A standard hardener rated 60 to 95 F means you know when it works, and low-bake or I.R. cure gives faster turnaround. The 4.2 VOC designation also matters in regions with stricter solvent rules.

Compared with the Speedokote SS-2950G Gallon Kit, which does not publish a mix ratio, U-POL is easier to plan around. It is the wrong pick for a driveway DIYer with a single fender, where the LiME LiNE 2K Urethane Primer or Acme Finish 1 FP410 Quart Kit are better sized.

6. Rust-Oleum Stops Rust Filler Primer: Best Oil-Based Sandable Spray Primer for Rust-Prone Areas

• Type: Oil-based filler and sandable spray primer with Stops Rust formula
• Size: 12 oz can
• Coverage: Up to 10 sq ft
• Dry time: Dry to touch and recoatable in 10 minutes
• Surfaces: Wood, metal and fiberglass

Pros:

• Dry to touch and recoatable in 10 minutes keeps a spot repair moving.
• The Stops Rust formula provides a rust-resistant base coat.
• Comfort Tip sprays from any angle, which helps with awkward positions under trim or wheel arches.
• The flat finish sands smooth for topcoat adhesion.

Cons:

• Coverage of up to 10 sq ft limits it to small areas.
• An oil-based, single-component primer will not fill deep scratches like a 2K kit.
• It is a general-purpose primer rather than a dedicated automotive refinish system.

Best for: DIYers who need a quick, rust-resistant filler primer for small metal or wood repairs.

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The Rust-Oleum Stops Rust Filler Primer is the only item here built around rust prevention, and the 10-minute recoat is the fastest stated dry time on the list. It is also the only one that lists wood as a substrate, so it makes sense for mixed projects such as trailers, tools or utility vehicles.

For serious body work it is the wrong choice. The Restoration Shop DTM4200 2K Kit and U-POL 4.2 VOC Gallon Kit have much more film build for filling scratches. If you want an aerosol that lists plastic and flexible parts, the LAUCO 57062 Aerosol Surfacer is the better option.

7. Speedokote SS-2790G Super Fill: Best Large-Volume High Build Primer Kit for Heavy Filling

• Type: Super Fill high build primer, gray
• Volume: 160.15 fl oz
• Kit parts: SS-2790G primer with SS-2790A component
• Highlight: High build and fill
• Mix ratio: Not listed

Pros:

• At 160.15 fl oz it is the largest volume of primer on the list.
• The Super Fill name and high build and fill description point to heavy leveling work.
• It comes in a matched primer and activator kit.
• It sits in the same Speedokote system as the SS-2950G, so the two share a brand and workflow.

Cons:

• Specs are minimal: the mix ratio, dry time and substrate approvals are not stated.
• The large volume is too much for small projects.
• Direct-to-metal use is not specified.

Best for: Shops and restorers who want the most primer volume per kit for heavy leveling work.

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The Speedokote SS-2790G Super Fill is the volume pick. If you are priming an entire vehicle and want to avoid reordering, 160.15 fl oz gives more primer than the 128 fl oz Speedokote SS-2950G Gallon Kit. The trade-off is information: the SS-2950G publishes fast dry and easy sanding, while this listing says only high build and fill.

Skip it if you want a documented mix ratio. The U-POL 4.2 VOC Gallon Kit and Restoration Shop DTM4200 2K Kit both state 4:1. For smaller jobs, the LiME LiNE 2K Urethane Primer is the more sensible size.

8. LiME LiNE 2K Urethane Primer: Best Direct-to-Metal Quart Kit for Corrosion Resistance

• Type: Sandable 2K urethane primer surfacer, direct-to-metal
• Kit size: 1.25 quart (40 fl oz)
• Mix ratio: 4:1
• Color: Light grey
• Resistance: Weather and corrosion

Pros:

• Direct-to-metal capability removes a separate etch primer step on prepared bare metal.
• The stated 4:1 mix ratio is simple to measure.
• Exceptional weather and corrosion resistance suits panels exposed to the elements.
• The 1.25 quart kit is sized for several panels rather than a whole vehicle.

Cons:

• Dry time and pot life are not listed.
• Light grey may need an extra coat before a very dark or very bright topcoat.
• Substrate details beyond metal are not stated.

Best for: Restorers priming sanded bare-metal panels who want corrosion protection without a separate etch coat.

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The LiME LiNE 2K Urethane Primer matches the Restoration Shop DTM4200 2K Kit in kit size and mix ratio, so the choice between them comes down to details. The Restoration Shop lists more about filling medium to deep sand scratches and substrate adhesion, while LiME LiNE emphasizes weather and corrosion resistance.

Choose it over the Acme Finish 1 FP410 Quart Kit when the metal is bare. Choose against it for plastics: the LAUCO 57062 Aerosol Surfacer lists plastic and flexible parts explicitly.

9. SEM 42013 Acrylic Primer: Best Single-Component Acrylic High Build Primer for Simple Prep

• Type: High build acrylic primer, grey
• Size: 16 oz
• Shipping weight: 1 lb
• Container format: Not listed
• Mix ratio: Not listed

Pros:

• Acrylic chemistry avoids the hardener handling that 2K urethanes require.
• The 16 oz size suits small repair areas.
• Grey color gives a neutral base for most topcoats.
• The SEM name is familiar in automotive refinishing.

Cons:

• Few specs are published, including coverage, dry time and substrate approvals.
• Acrylic will not match a 2K urethane for chemical resistance or fill on deep scratches.
• Container format is not stated.

Best for: Hobbyists who want a simple acrylic high build primer for small, shallow repairs.

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The SEM 42013 Acrylic Primer is the only acrylic on the list, and that is its reason to exist. Acrylic is more forgiving to handle than urethane, which matters if you do not want a respirator-intensive hardener workflow.

It is the wrong choice for serious filling. The Restoration Shop DTM4200 2K Kit and Acme Finish 1 FP410 Quart Kit are both 2K urethanes with more fill. For a pre-mixed aerosol alternative, use the LAUCO 57062 Aerosol Surfacer.

10. Restoration Shop DTM4200 2K Kit: Best Direct-to-Metal 2K Primer for Deep Sand Scratches

• Type: High solids 2K urethane primer surfacer and sealer (DTM4200)
• Kit size: 1 qt gray primer plus 1/2 pint hardener (1.25 qt mixed)
• Mix ratio: 4:1
• Shipping weight: 4 lb
• Adhesion: Bare metal, previously painted surfaces, body filler and most prepared automotive plastics

Pros:

• High solids content gives superior filling for medium to deep sand scratches.
• It sands easily wet or dry without loading the paper.
• It is fast drying, with excellent color holdout under urethane finishes and no shrinkage.
• It can be tinted with primer tints or base coat toner.

Cons:

• Numeric dry and recoat times are not given.
• The 1.25 quart kit is not enough for a whole vehicle.
• Variants only differ by color, not by size.

Best for: Restorers and hobbyists filling deeper scratches on bare metal, filler and old paint with one kit.

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The Restoration Shop DTM4200 2K Kit has the most complete description on the list, covering substrates, sanding, tinting and fill. It also comes in Black and White, which helps if you want a primer closer to your topcoat shade.

Compared with the LiME LiNE 2K Urethane Primer, which is the same size and ratio, the Restoration Shop gives more detail about what it fills and what it adheres to. It is the wrong choice for a full-body job, where the Acme Finish 1 FP410 Gallon Kit or U-POL 4.2 VOC Gallon Kit make more sense.

Buyer's Guide: How to Choose the Right High Build Primer

The core trade-off is fill against convenience. A 2K urethane fills and sands best but requires mixing, ventilation and a defined working time, while an aerosol or acrylic is simple but builds less film. Matching the primer to the depth of your sanding scratches and the size of the job avoids most problems.

Before choosing, check these project details:

• Scratch depth: Deeper sand scratches need a high solids 2K primer such as the Restoration Shop DTM4200 2K Kit.
• Surface material: Bare metal, plastic and old paint each need a primer that lists that substrate.
• Project size: Quart-class kits suit a few panels, gallon kits suit a whole vehicle, and aerosols suit spots.
• Working temperature: Hardener range matters, as with the U-POL 4.2 VOC Gallon Kit's 60 to 95 F rating.
• Mixing tolerance: Decide whether you are comfortable with a 4:1 mix and pot life or want a ready-to-spray can.

Primer Chemistry and Film Build

High solids 2K urethanes such as the U-POL 4.2 VOC Gallon Kit, the Restoration Shop DTM4200 2K Kit and the Acme Finish 1 FP410 Gallon Kit leave more film behind after the solvent evaporates. That film is what you sand to level scratches. A single-component acrylic like the SEM 42013 Acrylic Primer is easier to use but is better for shallow imperfections.

Oil-based aerosols such as the Rust-Oleum Stops Rust Filler Primer sit at the simple end. They dry quickly, 10 minutes to touch and recoat, but they are for small areas and light filling.

Kit Size and Mix Ratio

Kit size ranges from the 13 oz LAUCO 57062 Aerosol Surfacer to the 160.15 fl oz Speedokote SS-2790G Super Fill. In between are the 40 fl oz Acme Finish 1 FP410 Quart Kit and LiME LiNE 2K Urethane Primer, and the 128 fl oz Speedokote SS-2950G Gallon Kit. Buy for the job you have, because mixed 2K primer cannot be stored.

Mix ratio matters for accuracy. The U-POL, LiME LiNE and Restoration Shop kits state 4:1, which is easy to measure with a mixing cup. The Acme and Speedokote listings do not give a ratio, so read the container before you mix.

Substrate and Adhesion

Bare metal calls for a primer that states direct-to-metal capability, as the LiME LiNE 2K Urethane Primer and Restoration Shop DTM4200 2K Kit do. Plastic and fiberglass are covered by the LAUCO 57062 Aerosol Surfacer, which lists flexible substrates too.

Surface prep matters as much as the primer. If the repair involves cutting out rust and welding in patch metal, protect your hands with a pair of welding gloves and wear a respirator when sanding and spraying the 2K products. Clean, scuffed and dry metal is what lets any of these primers hold.

Application Format and Cure Conditions

Spray guns suit the kits, while aerosols suit small repairs. The Rust-Oleum Stops Rust Filler Primer has a Comfort Tip that sprays from any angle, which helps with awkward repairs. Cure conditions matter for 2K kits too, and the U-POL 4.2 VOC Gallon Kit is the one that states air dry, low bake or I.R. cure.

Plan your sanding around dry time. Fast-dry products like the Speedokote SS-2950G Gallon Kit let you block sand sooner, but allow adequate cure time before topcoat as the manufacturer directs.

Frequently Asked Questions About High Build Primers

What does high build primer do?

A high build primer lays down a thick film that can be sanded to level out scratches and minor surface flaws before paint. The Restoration Shop DTM4200 2K Kit targets medium to deep sand scratches, while the LAUCO 57062 Aerosol Surfacer handles lighter imperfections. The result is a flatter surface for the topcoat.

Is a 2K primer better than an aerosol?

For fill and durability, a 2K urethane such as the Acme Finish 1 FP410 Quart Kit generally outperforms a single-component can. Aerosols such as the Rust-Oleum Stops Rust Filler Primer are better for small areas where mixing is impractical. The choice depends on the size of the repair.

Can I apply high build primer directly to bare metal?

Only if the product says so. The LiME LiNE 2K Urethane Primer and Restoration Shop DTM4200 2K Kit both list direct-to-metal use. For others, such as the Speedokote SS-2950G Gallon Kit, confirm requirements before skipping an etch or epoxy step.

How much primer do I need for a whole car?

A gallon-class kit is the usual starting point, such as the Acme Finish 1 FP410 Gallon Kit or U-POL 4.2 VOC Gallon Kit. The Speedokote SS-2790G Super Fill offers 160.15 fl oz for more margin. Quart-class kits cover only a few panels.

What mix ratio should I use?

Follow the manufacturer's instructions for each kit. The U-POL 4.2 VOC Gallon Kit, LiME LiNE 2K Urethane Primer and Restoration Shop DTM4200 2K Kit list 4:1. The Acme and Speedokote kits do not state a ratio in their specs.

Does it work on plastic bumpers?

Check for plastic or flexible substrates in the product description. The LAUCO 57062 Aerosol Surfacer lists plastic and flexible substrates, and the Restoration Shop DTM4200 2K Kit lists most properly prepared automotive plastics. Always scuff and clean the part first.

Final Verdict: Which High Build Primer Should You Buy?

Best High Build Primers for most DIY and small-shop repairs start with the Acme Finish 1 FP410 Quart Kit: a 2K urethane in a 40 fl oz kit with hardener included and resistance to sand scratch swelling. Its main weakness is limited published detail, since the mix ratio, coverage and dry time are not listed, and the volume suits only a few panels.

For larger jobs, the Acme Finish 1 FP410 Gallon Kit brings the same chemistry in a 9 lb gallon kit, and the Speedokote SS-2950G Gallon Kit adds fast dry and easy sanding in a primer/sealer. The U-POL 4.2 VOC Gallon Kit is the choice if you need a stated 4:1 ratio and a hardener rated for 60 to 95 F, and the Speedokote SS-2790G Super Fill offers the largest volume at 160.15 fl oz.

For specialist work, the LiME LiNE 2K Urethane Primer and Restoration Shop DTM4200 2K Kit suit bare metal, with the Restoration Shop better for deeper scratches. The LAUCO 57062 Aerosol Surfacer handles plastic and mixed-material spot repairs, the Rust-Oleum Stops Rust Filler Primer suits quick rust-prone touch-ups, and the SEM 42013 Acrylic Primer is the simple acrylic option. If you are still undecided, pick the kit that matches your project size and surface, and start with the quart-class Acme.