"Flex Seal" for an RV roof?

It is a petroleum based rubber so as long as your existing roof is not damaged by petroleum products it should be OK.
I would not use it on any of the rubber roofing products but aluminum or fiberglass roof it should be OK.

From what I have read the general consensus is, don't use Flex Seal on a rubber type roof.

The Flex Seal apparently contains petroleum products that deteriorate the roof.

Does that apply to a TPO roof?

Heard it starts to flake after a few years. Guessing it would be much worst on a roof in full UV.

When we first saw it, DH bought some and it was great......but, after a few months, UV got the best of it. It only lasted about 6 months and then flaked off.

I used it on my S&B gutters. In just a few months it turned yellow and flaked off. I assume it was due to the UV. There is no way I would use it on my RV.

Total waste of money.

I've used it around the house, well, actually my utility shed (it was a good non-evasive guinea pig to try Flex Seal). So I used it on metal and wood on test areas, and quite frankly, I'll never use it again. The bottom line is ... if the item being sprayed has ANY dirt, grime, grease, even dust on it, the Flex Seal won't stick. If the item being sprayed as any moisture at all ... like wood, or gutters ... anywhere within 10 feet of it .... it won't stick. Where as, other types of sealers and caulks and even paint will stick to less than "pristine" surfaces, Flex Seal just peals and flakes right off.

So I suppose, if you can get the roof of your camper factory installed clean and dry, it (might) work. ... maybe. But I'll never use it again or try it again, on anything.

If I'm going to use a liquid rubber, I'll go to Lowe's or Home Depot and get this. It's worked well for creating rubber surfaces and making handles rubberized on old tools: This - Click here, or This - Click here also. But I'd never use either on the roof of my camper.

I have used Flex Steel to seal some gutter seams on the house. After a couple of years of exposure to sun and moisture, it dries out, cracks and starts to peal. I wouldn't use it on my RV roof. Would stick with the Dicor.

Me, I'd stick to what I KNOW works. :)