If it's getting on the outside on the edge of the tube, I'd be concerned about it getting inside the frame... especially if it's not due to leaving it in the rain, but from your atmosphere. I would think about using J.P. Weigle Frame Saver or boiled linseed inside the frame. Then I'd use Collonite's Insulator Wax #845 on the outside. This wax puts a nice shine on the bike, car, etc, yet was designed as a heavy duty wax for protection. On a car, it's truly a twice a year wax, and on a bike, I'll do it once a year. This stuff is great. It may be a bit hard to find locally, but of course there are places on the inter-web.

http://www.colliniteindustrial.com/#products