I built the Bobby Allison flat nose Monte Carlo with Powerslide decals, not the kit decals, which are Powerslide also, used Solvaset, Microsol and Microset everything worked great. I did let the big green portion of the decals set for a couple of days, I'm really over cautious, before putting any decals over them, worked great. Power slide decals are some of the best I've ever used. I'm not a great modeler but have been modeling for a long time. I don't think you need to coat them first unless you just want to. oh I also use setting solution for the tire decals, once dry coat with flat clear and then hit them with a Tamiya weathering stick to unbrighten the white.