Didn't mean to start a flame war about them not being collectible. Just meant that at least here in So Cal you can find totally complete, sharp, original bikes for what the pre-guys end up paying for a nice springer fork. 70/80's Middleweights are 'no regrets' bikes- however you build them, if you love it your way, that's great. There's nothing on a Spitfire that's so hard to find you'd sell your first born to Rumpelstiltskin for it (well ok, if you happen to find a Californa Cruiser, fine I'll grant you that one's hard and there were a couple less-than-common colors). But we've all popped onto eBay, seen that rare pre-war bit, checked the vendors other listings and it's clear they started with a totally complete creampuff and parted the whole thing out becasue the fender bob is worth more than a perfect Spit'.
Ask for 'mil spec' if you don't like you're powder thick, most quality powder shops are happy to do it thin, but lay it on fat becasue that's what people often think they want.
As for the decal issue, dealing with old decals can be tricky. Soak them just long enough for the paper to saturate then remove them from the water. If you just leave them in the water for ten minutes all the adhesive will float away. Let the decal sit out of the water for a minute or three to soften up, then when it's loose gently slide it on. You can also go to your local scale model store and get a product called "decal set" applied to the frame where the decal will go to help it adhere.