ORIGINAL: Stince
I was thinking a drop of glue to hold in place and hopfully not damage the paint too much if I remove it later.
Elmers Rubber Cement/Glue (can't remember which it is called)
Anyway, I've used it with sand bags directly on the tank and when I decided to remove it it did not affect the paint and the residual just rolled up with slight pressure with the finger.
- Jeff