How to Use POR-15: A Step-by-Step Guide

POR-15 is one of the toughest rust-preventive coatings on earth — but only if you prep correctly. Skip the prep and it peels; do it right and it lasts decades. Here's the proper process.

The golden rule: POR-15 needs the 3-step prep

1. Clean & degrease — remove oil, grease and grime so nothing blocks the bond.
2. Remove loose rust — wire-brush or sand off flaking rust (POR-15 bonds to sound rust, not loose scale).
3. Metal prep / etch — etch the surface so the coating grips. This step is non-negotiable on clean or shiny metal.

Applying it

Apply thin coats with a brush — two thin coats beat one thick one. POR-15 is moisture-cured, so a little humidity actually helps it harden. Recoat within the window on the tin (usually a few hours) for a chemical bond between coats.

Don't forget the topcoat

POR-15 is not UV-stable. Anywhere it sees sunlight, topcoat it — otherwise it chalks. On hidden chassis and tank surfaces, it's fine bare.

See our honest KBS vs POR-15 comparison if you're still deciding. → Shop POR-15