HI Dan,
SLC has the adhesive on it, and I don't add anything extra like Balsarite. The temps to attach and shrink are low enough to not harm the foam. I have even used it on a big stunter as an under layer for the silkspan on the open bays. It works great for that, being much more puncture resistant than straight silkspan. It also doesn't take as much clear to seal the silkspan so extra weight is negligible. It is "paintable", also.
So far I have really liked using it!
Bill