. The big difference between primers and penetrating epoxies (in a very general sense) is the amount of solvent. Primers are usually 10-25% solvent while penetrating epoxies are/were 50-75% solvent. Solvents are cheaper than epoxy so these products should, in theory, be cheaper than regular solvent free epoxies.

Aug 27, 2014 · This game plan is mostly from the advice of 1981gMachine who has been very helpful in sharing advice on the paint and bodywork stage. • Spray 2 coats of polyester filler, i.e. Slick Sand, and block using 100/150/80/220, applying guide coat in between grits. Initial 100 grit is to knock down most of the orange peel, 220 is after the panel is .... Preparation. No type of paint will bond to unprepared epoxy paint. Because epoxy painted surfaces don't allow adhesion, they must be abraded before they will accept new paint. Sanding the old epoxy finish with a 120- to 220-grit sandpaper will promote adhesion. Using a power sander will ease the process.