I used the DEI tape (got it from Autozone) and it has stuck well. Been a few months and probably 500 miles now. Went a bit wonkers with it, put on 3 layers in a 90 degree cross pattern. Used the DEI fiberglass wrap, got the fan on the radiator, removed the ball from the gas cap and drilled it out a bit. No boiling gas that I can detect.
I have a 70 Degree tank on the bike too - always carry plenty of fuel, rarely have less than a gallon of gas on board at the end of a ride. Dunno if it true or not, but I suspect carrying a bit more fuel helps keep it from boiling. More fuel = a bigger heat sink vs. a small amount of fuel, resulting in less chance of boiling? Just a theory, could be completely wrong :lol: