POR-15 is a brand of paint, formulated to seal and inhibit rust. Like other paints, POR-15 will not bond to metal unless the surface is etched prior to application. The same company that manufactures POR-15 makes an acidic etching solution that can be used to pre-treat the rusted metal. Unfortunately, in the hands of an amateur do-it-yourselfer, this solution could prove extremely dangerous. Condition your rusted metal for better adhesion before you apply POR-15 with a special etching primer that is much easier and safer to work with.
Things You'll Need
- Wire brush
- 80-grit sandpaper
- Water-based degreasing cleanser
- Steel wool
- Water hose
- Galvanized metal etching primer
- 2- to 4-inch china paintbrush
- Mineral spirits
- Opaque paint
Eliminate loose, existing oxidation. Scrape as much of the rust from the metal as you can with a sturdy wire brush and 80-grit sandpaper. Otherwise, adhesion problems will result.
Clean the rusted metal to encourage adhesion. Scrub the metal with degreasing cleanser and steel wool. Rinse with wet rags or a hose. Allow the metal to dry for about two hours.
Brush a coat of etching primer onto the rusted metal. Brush vertically, applying just a light coating to reduce the chances of sagging. Allow the base coat to dry for three hours.
Wash the china brush with mineral spirits.
Apply the POR-15 just as you did the primer. Allow the POR-15 to dry for three hours.
Tips & Warnings
- POR-15 is sensitive to UV rays. Exterior metal treated with POR-15 requires an opaque topcoat or fading will result. Apply the topcoat just as you applied the base and finish. Interior surfaces require no topcoat.
- Do not apply POR-15 to untreated metal or flaking will result.
- Do not use synthetic brushes with etching primer or POR-15.
- Photo Credit sun image by Sfetcu Andrei from Fotolia.com
How to Clean Rusty Metal Without Removing the Paint
Conventional wisdom says that if you want to remove rust from a metal object, you will have to sand it or use...
How to do Metal Acid Etching
Etching metal with acid produces interesting artistic effects, with the finished piece displaying a varied and complicated topography, thanks to the acid's...
How to Paint Over Rust Without Sanding
Rust not only looks unsightly, it is corrosive. If you leave it untreated, it can ruin the metal surface on which it...
How to Paint Rusted Galvanized Metal
Galvanized metal is steel coated with a thin layer of zinc oxide. Galvanized steel or metal is a common building material. The...
What Kind of Primer for Rusty Metal?
Unless it is galvanized, bare metal will rust if it's exposed to moisture and oxygen. Once rust sets in, it will ultimately...
Can You Put Self-Etching Primer Over Clear Coat & Paint?
Do it yourself painting can be a rewarding experience that can save you money in the long run, as long as you're...