I've always used an ACE hardware product called "Snow Roof" on my roofs - both home AND RV. It's a brilliant white, rubbery material about like thick cream in consistency - it applies easily with brush or roller, sets up quickly, and remains somewhat soft and flexible once fully cured - which is EXACTLY what is needed on RV surfaces facing rapid changes in temperatures, flexing and vibration. Never had any problems with it, and wouldn't use anything else!
AVOID like the plague stuff that has to be "gobbed" on with spatulas or putty knives - and stuff that dries hard as a rock - it will quickly crack open and leaks will return - and later treatments even with the proper stuff become extremely difficulit unless ALL the old junk is removed first...
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