Custom Shop White Epoxy Primer/Sealer 2.1 VOC (1/2 Gallon Kit)

In this review the Custom Shop KEP Series White Epoxy Primer/Sealer is evaluated for automotive and industrial users who need a Direct-to-Metal solution with strong corrosion resistance. The bottom line: this 1 to 1 mix, 2.1 VOC epoxy primer is best for technicians and hobbyists who want a fast-dry, lead- and chromate-free primer that adheres well to bare metal, aluminum and fiberglass and can double as a sealer before urethane or basecoat. Its biggest selling point is reliable adhesion and anti-corrosive additives for durable rust protection when applied correctly.

Key Features

• 1:1 Mix Ratio: Simple one-to-one mixing reduces measuring error and removes induction wait time so shops can mix right away and maintain consistent batches.
• Direct-to-Metal Ready: Formulated for DTM use, it bonds to bare steel, bare aluminum and fiberglass to provide a corrosion-resistant underlayer without extra primers.
• Anti-Corrosive Additives: Contains a blend of rust-inhibiting ingredients and offers good salt spray resistance for aggressive environments.
• Sealer Versatility: Can be used as a sealer for single-stage urethane or basecoat/clear systems, allowing topcoat application in about 30 minutes when reduced as recommended.
• Fast Dry and Low VOC: Fast drying characteristics and a 2.1 VOC formulation make it usable across regions while delivering quicker process times.
• Compatibility: Tops well with common automotive paints and clears, including urethanes and basecoat/clearcoat systems from major brands.

Who It's For

This epoxy primer is geared toward automotive restorers, collision shops and industrial users who need a high-performance DTM primer that also functions as a sealer. It is particularly useful where strong adhesion to bare metal, fiberglass, gelcoat or body filler is required and where anti-corrosion protection is a priority.

Users who need extremely thin, spray-easy materials or who are inexperienced with mixing epoxy systems may find some challenges; a few customers noted variability in sprayability and drying. For those who prioritize ultra-easy spray or a lower-viscosity product, a different primer or additional reducer may be preferable.

Pros & Cons

Pros

• Excellent adhesion to bare metal, aluminum and fiberglass when surfaces are properly prepared.
• Acts as both a DTM primer and a sealer, saving steps for single-stage or basecoat systems.
• Lead- and chromate-free formulation with anti-corrosive additives and good salt spray resistance.
• Easy 1:1 mixing ratio and a usable four-hour pot life after mixing.

Cons

• Some users report inconsistent sprayability and longer drying times depending on conditions, so thinning and gun setup matter.
• Thickness and handling can be challenging for first-time epoxy users without proper reducers or technique.

Specifications

Our Verdict

The Custom Shop KEP Series epoxy primer is a practical, cost-effective DTM primer for shops and experienced DIYers who need strong adhesion and anti-corrosion performance. It delivers good value when surface prep and spray technique are followed, and its sealer function speeds up multi-stage refinish work, though novices should prepare for some learning curve on thinning and spray settings.

Frequently Asked Questions

Can this be applied directly to bare metal?
Yes, it is formulated for DTM use and bonds to bare steel and aluminum when surfaces are properly cleaned and prepped.

How long after mixing can you topcoat?
As a sealer, topcoat or basecoat can be applied in about 30 minutes if reduced with 1/2 part XR70 or UR70 reducer as recommended.

Is this a low VOC product?
It is a 2.1 VOC lbs/gal product that is formulated to be used across regions while meeting performance needs.