Permatex Rust Treatment 16 oz — single-step rust converter that stops corrosion and leaves a paintable black primer

Permatex 81773 Rust Treatment is a single-step formula that chemically removes existing rust and leaves a durable, paintable black polymer coating.

When metal components have surface rust, Permatex 81773 offers a fast conversion treatment designed for automotive and equipment applications. Applied by brush or spray, it reacts with iron oxide to stop active corrosion and forms a protective coating that accepts topcoats and works with body filler and fiberglass. This 16 oz container is intended for surfaces that remain below 200°F (93°C) and performs best between 50°F and 90°F (10°C–32°C).

How quickly does Permatex Rust Treatment stop rust and form a coating?

The conversion begins right after application and within minutes rust is chemically transformed and a black polymer film develops. Drying and full cure times depend on temperature and humidity, but the visible protective layer appears rapidly and can be inspected shortly after treatment.

• Visible polymer coating forms within minutes
• Works at 50°F–90°F (10°C–32°C) for best results
• Surfaces must not exceed 200°F (93°C) when applied
• Brush or spray application for fast coverage

Can I paint over the treated surface or use body filler?

Yes — the resulting black polymer acts as a sound primer that accepts most topcoats and is formulated to be compatible with body filler and fiberglass repairs. Light scuffing or sanding before painting can improve adhesion for best finish results.

• Coating is paintable and functions as a primer
• Compatible with body filler and fiberglass work
• Recommend scuff-sanding for optimal paint adhesion
• Topcoat selection should match the service environment

Where is this rust treatment intended to be used and where is it not recommended?

This product is made for many metal items on vehicles and equipment: from trucks, trailers, tanks and valves to farm implements and marine decks when topcoated properly. It is not intended for cosmetic repairs on automotive exterior sheet metal where replacement or specialized panel repair is required.

• Suitable for automotive parts, trailers, fences, and agricultural equipment
• Can be used on hatch covers and decks with appropriate marine topcoats
• Not recommended for exterior sheet metal body panel repairs
• Do not apply to surfaces hotter than 200°F (93°C)

How do I apply Permatex 81773 for the best results?

Surface preparation and application method influence effectiveness: remove loose scale and heavy dirt first, then brush or spray the product evenly over all rusted areas. Allow the conversion reaction to occur and the black coating to form before sanding, filling, or painting.

• Remove loose rust, dirt, and grease prior to application
• Apply evenly by brush or spray for full coverage
• Let the coating develop before further sanding or painting
• Follow temperature guidelines for optimal performance

Who is this for: Permatex 81773 Rust Treatment is aimed at mechanics, restoration hobbyists, fleet and equipment managers, and DIYers who need a quick, single-step rust converter that creates a durable, paintable primer layer. It’s useful for projects where stopping active rust and preparing a surface for filler or topcoat is more practical than part replacement, provided the surface and service conditions fit the product limits.