Please help. I am making the razorback version of the p47 and am having trouble sheeting the razor spine. So far I have cracked 4 pieces of sheeting just trying to conform it to the curve. Needless to say frustrating. I wetted down the sheeting with ammonia and water and I just don't know what to try next. If the sheeting didn't have to contact the stringers then it probably wouldn't crack, but then it would not be securely glued.
Any advice would be appreciated.
Thanks,
bob