Is Rust Bullet Compatible with Automotive Fillers, Fiberglass, and Primers?
Yes. Body fillers, fiberglass, and automotive primers may be applied directly over Rust Bullet. Two coats of Rust Bullet should be applied to the metal surface. The body filler, fiberglass, or primer should be applied directly over the second coat of Rust Bullet between 24 to 48 hours. If more than 72 hours have lapsed, the Rust Bullet coating should be etched with Rust Bullet® Metal Blast (simply spray it on, wait 15-30 minutes, either hose it off or wipe it off with warm water and a shop towel, and let dry completely), or sanded with 100-150 grit sandpaper, before applying the filler, fiberglass, or primer, to ensure proper adhesion. This 72 hour period is decreased in areas with higher humidity levels. After the application of the filler, fiberglass, or primer, an additional coat of Rust Bullet should be applied to seal and protect the entire surface. Rust Bullet can be applied over existing fillers, fiberglass, or primers after scuffing the surface with 100-150 grit sandpaper or sa
