Cerakote Air Cured: High-Temp Firearm Finish. No baking necessary. Don't be fooled by others on Amazon who are supposedly "re-bottling" and "re-packaging" Cerakote into their own sizes and amounts with no manufacturer warranty. This is FACTORY BOTTLED & PACKAGED and shipped directly to you in true 4 oz bottles. All Air Cure product is factory sealed with black heat shrink tape on the bottle and cap per the manufacturer bottling process... *****NOTE: Manufacturer recommends using a blast box to prep surface prior to finishing. If not available, similar results may be achieved with a regimen of cleaning, disassembly, de-greasing, and then using very fine aluminum oxide paper/sponge or a scotch pad/steel wool, to prep the surface. This helps with full adhesion.