Did you fit the artwork dry & does the cab need to be resealed prior, got artwork for mine, just working up the courage  

With this one I decided to sand the living hell out of it with the orbital sander (after getting the old decals off) and put them on dry to the bare wood and it seems to work fine.. Though when I do the next one I think I will seal with poly urethane sealant..

Otherwise I do them like this guy, sticking a bit first and slowly peeling back, dry...