I have no doubt you can read. Comprehension is probably the issue. It clearly says epoxy and poly primers should not be applied over SELF ETCHING PRIMER. At no point did you say you used self etch as this would be your reasoning behind the issue of compatibility between dp and slick sand (there is absolutely no compatibility issues with this combo)... I have sprayed HUNDREDS OF GALLONS OF DP WITH ZERO ISSUES EVER. Please don't let your inexperienced problems misguide another novice. It gets really old reading the arm chair painters advice to people who don't have a clue if the information is correct or not. No further comment.