Greetings Steve!
I've never used a marmolium heat gun, but from the installation instructions from reputable vinyl heat guns like forbo (
forbo welding instructions) only the welding rods make any difference.
Sorry about the late reply, it seems that alot of our regulars were on vacation earlier.
"Why is the only time I'm right have to be when I realize I'm wrong?"
~Nathan the Stout