Couple things that might be causing these problems. Are you mixing different types of paints/primers (i.e., lacqour, acrylic)? Are you giving the paint time to dry/cure before the envirotex? Most need at least 24 hours before you clear coat. Also check on the paint label about recoat times. Most are something like, within 20 min, or after 24 hours. If you do it between these times, you'll get cracking. If you are using spray cans, the Rustoleum works quite well.
Jigman
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