Can I use Z2 on non-clearcoated paint? Some of my interior is spray painted, and I can't clearcoat it due to the type of paint I used. I already have some Z2, and really don't want to buy Z3 for some small little pieces, but I don't know if it'll be ok to use the Z2 on them. I know Sal would probably endorse Z3 but if Z2 will work fine then that's fine with me lol.