Fred, on my first Hellcat I cover rudder and elevators with Oratex and paint it. After some time on those parts I saw some small cracks and on one - two edges oratex start to flipping out.
On next F6F (yellow) I cover those parts with 0,8 mm balsa, and made details with filler. First, construction is much stronger, no more worry about flipping out, and cracks, all in all, I think that is much better solution.

http://www.rcuniverse.com/forum/m_37...25/key_/tm.htm

Think about that...

Regards

Mirce