Best Automotive Primers for Filling Deep Scratches (2026)
We ranked products by filling performance, adhesion (including direct-to-metal capability), format suitability (aerosol vs. kit), user ratings, and overall value
This roundup covers automotive primers suited for filling deep scratches and restoring surface integrity before color and clearcoat. Selections prioritize high-build filling ability, substrate adhesion (including direct-to-metal urethane options), and overall value across aerosol and gallon kit formats
Top Picks
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1
Dupli-Color Filler Primer Gray 11 oz aerosol
Filler primer with high-build automotive formulation for filling deep scratches and imperfections. Fast-drying, sandable finish promotes top coat adhesion and smooth, rust-resistant surface. Customers note ease of sanding and value, with mixed spray quality feedback
- high-build formulation
- fast-drying with 30 min touch dry
- reduces top coat issues
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2
Dupli-Color Filler Primer, Red 11 oz aerosol
Dupli-Color Filler Primer is a high-build automotive primer that fills deep scratches and imperfections and sands easily for a smooth, rust-resistant surface. It dries to touch in 30 minutes and can be handled in 1 hour; customers note it sands well and functions as a primer and filler
- fills deep scratches and imperfections
- fast-drying and sandable finish
- improves top coat adhesion
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3
U-POL 1 Gallon Urethane Primer Kit with Hardener
High solids urethane primer with a 4 to 1 mixing ratio for direct-to-metal use. Offers excellent opacity and hiding power, with air-dry or low bake curing options. Customers note high quality, good coverage, and easy sprayability
- 3 in 1 direct-to-metal primer
- high build urethane with 4 to 1 mix
- effective opacity and hiding power