go to a autobody supply shop, get wax and grease remover. follow directions on bottle. this should cure your problem with "ORANGE PEEL". i have had to do this sevral times on various projects. the last one was a wood hydro, i had to paint 3 times to get perfect results. the last time i used wax and grease remover and it turned out like glass! hope this helps and good luck. use after priming and sanding. last thing used on surface b4 painting!