Permatex Rust Treatment rust converter 16 oz — fast-acting, paintable black polymer finish

Permatex 81773 Rust Treatment is a brush-or-spray formula that chemically removes existing rust and leaves a durable black polymer coating that can be painted over. Permatex Rust Treatment (16 oz) converts flaky iron oxide into a tough, protective finish in minutes, simplifying restoration and maintenance tasks on metal equipment. The solvent-based liquid is designed for automotive parts, farm gear, fences, tanks and other steel surfaces where you need to stop active rust and create a paint-ready primer without heavy grinding or replacement.

How quickly does it stop rust and what happens after application?

Rust Treatment works fast: applied by brush or spray, it reacts with rust within minutes and forms a black polymer surface that stabilizes the metal. That coating seals remaining corrosion and protects against immediate re-formation while serving as a base for paint.

• Visible neutralization of rust in minutes
• Leaves a durable black polymer finish
• Coating is compatible with paint and topcoats

Which surfaces and temperatures are suitable for use?

Use on ferrous metal surfaces such as chassis, trailers, pipes, valves, tanks, agricultural implements and marine tops (topcoat with marine paint as needed). Apply when ambient temperature is between 50°F and 90°F (10°C–32°C) and when the surface is below 200°F (93°C).

• Designed for automotive applications (except exterior sheet metal repairs)
• Safe for structural metal, valves, decks, and farm equipment
• Not intended for hot surfaces exceeding 200°F

How is it applied and what preparation is required?

Minimal prep often required: remove loose scale and heavy flaking rust, then brush or spray the product directly on the affected area. Within minutes the rust converts and a black polymer coating develops; after curing you can sand, use body filler or apply fiberglass where needed.

• Brush or spray application for versatility
• Compatible with body filler and fiberglass repairs
• Can be sanded and painted after curing

What makes it a good primer substitute for corroded parts?

The converted polymer finish adheres to the metal and provides a stable, paintable surface—reducing the need for full panel replacement in many cases. It acts as a protective base that improves topcoat performance on previously rusted areas.

• Produces a tough primer-like coating over treated rust
• Paintable and compatible with common topcoats
• Helps extend the service life of repaired components

Who is this for Permatex 81773 is aimed at mechanics, restorers and DIYers who need a fast, reliable way to neutralize rust and prep metal for painting without full teardown. It’s a practical choice for truck and trailer maintenance, agricultural gear upkeep, marine tops (with appropriate topcoat), fences and storage tanks—anyone who wants to stop active corrosion quickly and create a paint-ready surface without replacing the part.

FAQ

Q: Can I paint over Permatex Rust Treatment?

A: Yes. After the black polymer coating cures, it can be sanded and topcoated with compatible paint.

Q: Is it safe for marine use?

A: Yes for tops and hatch covers when followed by an appropriate marine topcoat; not a substitute for full underwater coatings.