I was having trouble masking some curved areas on my B-17. Then it hit me, Why not use blue painters tape lay it over the curved area and go over it with a sharp #2 pencil. Remove the tape place it on a piece of glass an use a new # 11 blade and cut it out and place it back on the model.The results were perfect. This is much better than using 3or 4 pieces of tape to get the curve masked. I tried to use the thin 3M tape but it would lift on the sharpe curves. I would post a picture if somebody could point me in the right direction.
You can go to photobucket.com and download your pics there. It’s free and easy.
Good luck with your build!
Andy