This unique product applies like typical plastic fillers, yet is made with fine aluminum particles, which helps make for a stronger repair. Waterproof so there is little chance of corrosion under the patch area. Heat resistant properties make it ideal to use before powder coating. Apply right to bare metal to smooth minor ripples in body work. Hardener included. Use Eurosoft Glazing Putty (31079ZP) as a final step to fill pinholes and small imperfections before painting. Store in a cool dry place.