Sky, thanks for the input. I would think this is a lot easier on top tanks that you can remove! I'm looking at the tank on my Mobys and a Puch which are part of the frame.
I really don't feel like stripping the bikes down to do this - someone had mentioned getting down to the frame and hanging from the ceiling to be able to rotate and turn it upside down to get the whole tank coated.
Does the Por-15 just have to go over an area one time to work, rather than having to stay in contact for an extended period?