After reading this thread, I decided to seal my Ultacote seams before I fly my Aresti. There is Top Flight "Trim Solvent"--I could find no such thing as "No Heat." I believe it's the same thing, just sold under a different label.

Anyway, I tested it on scrap UltraCote today, and it works fine. It's a tight bond and it cleans up real nice. The bottle says "Trim Solvent is designed to be used to apply MonoKote over MonoKote and most other heat-activated film coverings."