I have been using an X for combat for the last 6 mos or so. Covered in Ultracote I have had zero issues with wing twist or flex. I definitely loaded the wing up w/3m77 and let it set up. I also put bidi tape over the spar top and bottom and protected the LE with it.

Even with full poweron dives I have yet to see even a flex out of the wing. It has been rebuilt many times from damage and all of my repairs have still made the integrity of the wing great.

Just my .02
NAES