I Use Them And I Do Use Heat To Apply Them.If You are Having A Problem Try Monokote Trim Solvent.It Will Allow You To Move The Trim Piece Around Then Let It Dry And It Will NOT Come Off.
The Only Set Back Is That It Stinks Big Time And Can Be Dangerous .You MUSt Have Good Ventilation.
Guess How I Know.Still Good Stuff.
Tower # LXHZ43