RE: Fiberglassing the airplane questions.
Alex,
I'm no expert but I have a couple of fibreglass jobs behind me (and another US60 soon to start). Here are my comments:-
1. Seams are no problem at all with lightweight cloth, you just sand them out. This applies to both you wing LE and other seams. I used .58oz cloth and was able to hide all seams completely
2. I have had no problems applying over exisiting provided it is well sanded first. And anyway, if you have a heavy reinforcing cloth do you need to run the finishing cloth over it?
3. My preference with painting is to use a water based paint then put a clear coat over it. This means I can use an airbush for painting (worked OK on my 60 TF Corsair) and clean up with water. Someone in the US can advise you what's best, I have heard Nelsons is good.
Good Luck
Terry