cocomfix Ultra 2-in-1 Rust Converter Primer — Black, Heat-Resistant to 350°F, Paintable

cocomfix Ultra 2-in-1 Rust Converter Paint & Metal Primer is a single-coat reformer that converts active rust into a durable, heat-resistant black coating while acting as a paintable primer.

Built for mechanics, fabricators and DIYers, this all-in-one product treats corroded metal and creates a surface that accepts finish coats without sanding or separate priming. The formula bonds to rust, seals out moisture and tolerates high temperatures up to 350°F, making it suited for vehicle underbodies, trailer frames, industrial equipment and outdoor structures exposed to salt and weather.

How does this product stop rust without sanding or a separate primer?

cocomfix Ultra uses a reactive chemistry that transforms iron oxide into a stable black matrix which adheres to the metal. This eliminates the need for full mechanical removal of light-to-moderate rust and provides a paintable surface in one step.

• Converts up to 50 μm of rust in a single coat
• Creates a tough, peel-proof layer that bonds to corroded areas
• Seals out moisture and salts that drive further corrosion
• No separate primer or sanding required for many applications

Will the coating survive heat, salt, and outdoor exposure?

The reformulated finish is heat-stable to 350°F and resists UV, salt spray and impact, so it holds up on hot exhaust-adjacent parts and coastal vehicles. It’s designed to maintain adhesion and integrity in harsh environments where rust typically reappears.

• Heat resistance up to 350°F for thermal shock areas
• Engineered to resist UV fading and salt corrosion
• Impact-resistant and peel-proof for long-term durability

How do professionals use cocomfix Ultra on automotive frames and trailers?

Pros apply the product directly to wire-brushed or loose-rust-free surfaces to lock in remaining corrosion and provide an immediate primer layer. It’s commonly used on frame rails, suspension components, trailers and structural welds where access for full sandblasting is limited.

• Apply one even coat over flaky or oxidation-affected areas
• Allow recommended cure before topcoating with compatible paints
• Ideal for areas impractical to sandblast or replace

What are the practical limits and care instructions?

While powerful on light to moderate rust, mechanical removal is still recommended for heavy scale or loose metal. Use basic surface prep—remove grease, loose flakes and heavy scale—then apply per instructions and allow full cure before subjecting to stress or paint finishing.

• Not intended to replace full media-blasting on severe corrosion
• Works best on clean, dry metal with loose rust removed
• Follow curing times and recommended overcoats for the top finish

Who is this for? cocomfix Ultra 2-in-1 Rust Converter Paint & Metal Primer suits mechanics, restoration shops, fleet managers, farmers and hands-on homeowners who need a fast, dependable way to neutralize rust and protect metal in one step. If you need a durable, heat-resistant encapsulator for frames, trailers, industrial gear or outdoor structures and want to avoid multi-stage priming, this product provides a practical, professional-grade solution with a satisfaction guarantee.