1950–1979 VW Bare Metal Rust Treatment – MWorks Metal Etch – 1 Pint
Rust Protection and Paint Prep for Bare Metal
MWorks Metal Etch is a reusable, non-toxic, and non-flammable solution designed to treat bare metal surfaces before painting. Whether you're restoring a VW fender, prepping steel parts for primer, or protecting fabrication work, this specially formulated liquid gently etches exposed metal while leaving behind a zinc coating that promotes long-term adhesion and resists flash rust for up to six months.
This is a great step to use after removing corrosion with MWorks Rust Remover. The Metal Etch locks in a uniform gray zinc phosphate finish, giving paint something to grip while minimizing re-rusting—even in humid or uncontrolled environments. MWorks Metal Etch is safe for use on any metal part and works on all types of automotive or shop metal, not just classic Volkswagens.
Application Versatility
MWorks Metal Etch can be applied by brushing, spraying, or dipping parts directly into the liquid. Shake well before use. The surface should be clean and degreased. Maintain metal temperature around 70°F to 100°F for best results. The treated surface should remain damp with Metal Etch for at least 30 minutes before drying to a uniform gray coating. For maximum paint performance, topcoat promptly or encapsulate with a sealer.
Features
• Inhibits rust on bare metal up to 6 months
• Leaves a zinc phosphate layer to chemically bond paint
• Gently etches the surface to remove light flash rust
• Can be brushed, sprayed, or dipped
• Non-toxic, non-flammable, and reusable
Where to Use
• New steel and sheet metal panels
• Sandblasted or wire-wheeled components
• After MWorks Rust Remover on de-rusted parts
• Tools, brackets, restoration projects, or shop equipment
Companion Products
• MWorks Rust Remover
• MWorks Rust Encapsulator
• Mineral spirits or acetone for cleanup
Dimensions and Weight
• Volume: 1 pint (473 mL)
Because Details Matter
Whether you’re restoring your vintage VW, fabricating new brackets, or prepping bare metal on a modern project, MWorks Metal Etch is your chemical insurance policy against rust creep and paint failure. Give your primer the foundation it deserves—use what restoration shops and builders trust.
Also known under these part numbers: (For reference only)
Quick FAQ
What types of metal does Metal Etch work on?
Metal Etch is effective on ferrous metals, such as steel and iron.
How does Metal Etch work?
Metal Etch contains phosphoric acid, which removes light surface rust as it gently etches bare metal. Simultaneously, it lays down a zinc phosphate coating that inhibits corrosion and promotes primer or paint adhesion.
Should the surface be prepped before application?
Yes. For best results:
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Remove all grease, oil, and surface residue.
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Residual contaminants may interfere with adhesion of subsequent coatings.
Can the product be reused?
Yes. Metal Etch can be reused after the metal part is dipped. Ensure the product is stored properly after use.
Will Metal Etch harm the metal?
No, if used correctly. Metal Etch uses phosphoric acid to etch the surface. If parts are left submerged too long—especially when dipped—it may start to aggressively etch the metal surface. Monitor soak times carefully.
Does temperature affect results?
Yes.
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Optimal application temperature is between 70°F and 100°F.
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Below this range: Reaction slows, risking incomplete treatment.
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Above this range: Solution may evaporate too quickly, limiting effectiveness.
How do I clean up?
Clean excess Metal Etch from metal surfaces using mineral spirits or acetone.
Directions
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Shake well before use.
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Remove all loose rust and dirt using a wire brush, sandpaper, or similar tool. Clean thoroughly with degreaser to remove oil and contaminants.
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Apply Metal Etch directly to the bare metal surface by spraying, brushing, or dipping.
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Allow Metal Etch to dwell on the surface. The etching reaction will begin immediately as it removes light rust and lays down a zinc phosphate coating.
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Monitor the surface during treatment. Do not allow Metal Etch to dry on the surface before rinsing.
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After treating, rinse thoroughly with water and allow the metal to dry completely before applying primer, paint, or additional coatings.
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Metal Etch can be reused if stored properly.
IMPORTANT: If Metal Etch is left on longer than recommended, it may etch the metal too deeply and interfere with future paint adhesion. Keep Metal Etch wet during application. Do not allow Metal Etch to dry on the surface.