Do not use your heat gun!
I love love LOVE this crackle paint. Of course I love all of the crackle paints by Ranger, but the metallic line is excellent. Great coverage. It does take a bit longer to dry than the regular crackle paints. At least 30 minutes, but the look is totally worth it. It looks really great on grungeboard because it settles into the designs. The only thing to remember is that you can't use your heat gun to speed up the drying time with the metallic crackle paint.