For vinyl sheet flooring, is there any way to tell if I have a felt
backing (requiring a full glue) or a vinyl backing (requiring just a
perimeter glue)?

The sheet is new, completely unmarked, and very inexpensive stuff.
Backing almost seems like paper. Retailer told me to do full glue, but
didn't seem very confident about that. But the existing floor
(identical floor material, very likely from the same store) had used
just a perimeter glue. This seemed to work just fine, and it made
tearoff a snap. I am replacing the floor now only because of water
damage from a unnoticed toilet leak.


Thanks!
-Kevin