Although Henry’s is a good brand, not all their products are appropriate.?I do NOT recommend the one called Tropicool.? The reason is that is it silicone-based and nothing will adhere to it ever again after it begins to deteriorate, which could be in as little as just a few years.? ?
Instead I recommend any version of roof sealing product for metal roofs that is labeled as “elastomeric sealant.”? It flexes like silicon, however more can be added to it without removing it ?when some deterioration develops.? If that is what you already have, then it can be scrubbed clean and more applied. ?
Dicor brand makes a highly-recommended elastomeric roof sealant.? It will take about one gallon per coat, and at least two coats are recommended and three is even better.? Five gallons is too much unless you have a way to store it tightly sealed for a few years until you want to use up the rest.?
I also do not recommend any product labeled as “Rubber Roof Sealant.”? That is specifically for rubber membrane roofs. ?Unless you have a Toyota Odyssey Americana, no other Toyota RVs came with a rubber membrane roof. ?
The important thing is no matter which version of elastomeric sealant that you get, the preparation is extremely important.? If the roof is not scrubbed completely clean, no sealant will stay put and will begin to peel rather soon.
In addition, applying self-leveling caulk. aka "lap sealant," is needed before the roof is “painted.”? ?Dicor brand is recommended, in Ivory rather than white. ?After scrubbing thoroughly, squirt it all around any vents and seams that have cracks. You will need 2-3 tubes.?
Eternabond tape DOES seal well, but it looks somewhat unsightly (kinda like band-aid), because it only comes in bright white.? Another drawback is that it does not work well at all on curves without lots of time-consuming “notching.”
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Instead, porous fiberglass fabric tape is what the professional RV roof sealing shops use around every opening.? After it is applied, it is coated (and therefore infused) with the roof sealing paint that makes it stick with a tight seal. ?
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The professional RV roof sealing companies also sell their products for DIY use, to folks who are in a position to attempt it on their own.? It is worth it to spend more on their roof paint and accompanying products if you are going to keep your RV for a while.? The directions need to be followed carefully for best results.? If you have it sealed in a shop, they’ll give you up to a 10 year warranty. ?
