Do yourself a favor and get a trim iron
The trim iron works wonders. I used it on my horizontal stabilizer and the curves look 100 % better than the rudder. Unfortunately, I warped the stabilzer somehow:
[link=http://www.rcuniverse.com/forum/m_5857415/anchors_5857415/mpage_1/key_/anchor/tm.htm#5857415]http://www.rcuniverse.com/forum/m_5857415/anchors_5857415/mpage_1/key_/anchor/tm.htm#5857415[/link]