i use dupli-color primer when i shoot nail polish...also if u want the nail polish to be bright use white primer...gray or red will make the color darker...the nail polish needs to be thinned for the most part 50/50...i dont think u can spray it without primer...i also find that it dries really fast so not sure why u would need a hardener or accelerator...thats my 2 cents im sure u will get more info form others here who are much more knowledgeable then me....