[vespaholic]

@Pyrotechnic:
The DAP from Home Depot is what I had planned to try.
IMHO the foam is unnecessary; probably just part of the original product that GM sourced.
My fiberboard substrate is solid as a rock and the vinyl is simply vinyl.
It doesn't know that the foam ain't there.

@TKCR:
I understand your point, but I need to take a cut at using the original vinyl.
Mainly because it's the original vinyl.
Worst case I ruin it and need to buy new.

Will advise as I plan on giving it a try tomorrow.
EDIT: Actually, I won't be trying this until the warmer weather gets here. I just read the instructions and it should be 65 degrees to use the DAP.