Quoted from Lovef2k:The cab side are sanded to bare wood but I have a few spots of bondo, can the decal be placed directly over or do they need to be sealed as well? I'm trying to keep the surface as flat as possible. I also have rapid prep and rapid tack on hand.
I prime and paint the whole surface where the decals go but that is my routine. I have also done the decals dry since my first decal failure using rapitac 15 years ago on Addams Family. 2 decals just had bubbles appear. I’m sure it was my fault and many swear by the wet method but Bryan Kelly used to have a video I think that convinced me to try it and I’ve done it ever since. If you line up and go slow it is virtually like putting on stencils or a hardtop.i use a kitty litter box to hold them in place after I triple check the alignment.
Good luck either way