Do you remove paper before using tape or tape over paper?
Same here - I keep the paper for structural reasons. The paper as a great deal of rigidity and tensile strength the foam simply doesn't have on it's own.
as we all know, the paper looses the stiffness and tensile strength when water is added.
I have accidentally ordered an adverse amount of Scotchgard waterproofing spray (4 bottles- I really needed 1 1/2 for gear and a test plane) I was going to test this on a few planes... one with tape, one with out, one before then taped.