no i swear i used thick ca for my twin jet i repaired it yesterday with non foam safe ca just normal ca but it does melt other foams thats true but the Elapor foam can take it. Whith my tj the instructions even said you can use normal ca. If you dont believe me put a drop of ordinary ca on your tj where no one can see it and you will see it works ive repaired my tj more than i care to say and all with thick normal ca