The tape wouldn't work in mine. The clearance is so rediculously tight that a tiny less than 1/4 inch squar piece of paper made it so tight it was really difficult to remove. Tape would be way too thick. Besides, there's so many holes for water to get into a paintball gun it wouldn't mater if you did teflon it. If water proofing is really what you're after.
Suffice it to say, don't drop your gun a puddle.