I just fixed my wing on my Sig LT 40. The trailing edge of one wing was bowed and I didn't notice it until I had the wing half together. The bow was curved in the middle. The other wing was built on the same board and was not warped.

I soaked just the trailing edge by standing the wing upright for about 24 hours in 75% water and 25% ammonia. Fumes were terrible. I then laid the wing on a flat stable surface and set a weight on just the trailing edge in the middle for two days without messing with.

The wing came out straight as a board. The only thing was that the trailing edge had swelled from the water and need some sanding on top and I had to take off about an 1/8th inch off the back side. I did all that after I mated the two wing so that I could tell where I was on the re-work. A veteran flier told me to do this. You might try it. Or re-build the wing from scratch. Did not appeal to me, this is my first kit.