I saw it at Menards. It can be used with pooling water and is not water soluable. I'm going to try it on a EPDM roof on my wifes art studio. If I like it, the RV is next. Appears much easier to use than the two part "Liquid Roof" EPDM product.
It's just another Elastomeric - we use it on the roofs of the mobile homes in the desert and there are probably a dozen different suppliers including Henrys and range from $60 a 5 gallon drum to $160 for the top notch stuff.
It doesn't chemically bond to the surface - just a mechanical bond so surface needs to be well prepped. It forms a thick 'rubber' skin that is 100% waterproof but water can creep underneath it from splits or edges.
Typically we recoat every 2-3 years in the desert.
It should work on an RV as it remains flexible - just make sure the surface is clean and pretreat any cracks or leaks with Dicor sealant first and let it cure before applying.
We put the white liquid RV roofing on last weekend. Little prep work and four hour work time, squeege it out and smooth out with a roller. Goes over a rubber roof nicely, guess that is similar stuff, our roof was 20 years old and in pretty decent shape. Just wonder the price on that stuff.