If you mean RV FlexArmor, we had it put on a few years ago, and have been very happy with it. It seals from gutter edge to gutter edge, and from the front cap to over the rear cap. No more caulking. They remove the AC units and spray down into the unit, so if your AC seal ever leaks, it will go into your unit, and not inside the roof. They replaced a few sections of roof that were damaged for a reasonable price. The roof has a lifetime guarantee, and was less than what my local RV dealer would have charged for a replacement rubber roof. https://rvroof.com
There are a number of companies with similar sounding product names, so make sure you are getting RV FlexArmor. I spent a fair amount of time with the inventor in Green Cove Springs, FL who explained how he came up with the material, watched how they prep and spray, and was impressed. When we scheduled our unit to be done, brought it in Monday morning, they promised for Wednesday afternoon, and it was done on time. They even kept the RV plugged in so our refrigerator would keep everything cold. Very nice couple who run the main site, they have a few franchises around the country and seem to be growing. Any questions, let me know.