FWIW, I only knew about the Dicor kit. It is a bit of a P.I.T.A. to apply but once done, it only needs a re-coat every few years.
It is a two part deal. After you wash and dry the roof (after taking off all AC and vent covers and sealing any cracks with their self-leveling sealant), you apply a special adhesive primer (in sections unless you are working off of scafolding or ladders from the sides) and then shortly after the top coat.
I believe you use brushes and rollers to accomplish this process. It basically adds another breathable layer of rubber to the roof and is supposed to create a bond like concrete re: strength while still remaining flexible.
I think the 30' MH kit runs around $500 and then you buy more primer and top coat for longer coaches (like ours...
).
I know nothing about the other but if it is a one part (like Cool-Seal), you just have to thoroughly clean and dry the roof. I have used Cool-Seal and it works O.K.
A replacement rubber roof install runs around $5,000 or so for a 40 ft. long coach if my memmory serves me correctly and it "should" be done in a controlled, covered environment unless you have really good weather and no dust or bugs.
Just my $.02 again.
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