Eternrbond
Janicenlarry
As the service manager for an rv dealership, I've used that product to fix-up the roofs of some of our older trades. It works well on the seams of these roofs, but I think there are better products for use on rubber or composite roofs. (I even used it to seal a stubborn leak around a skylite in my home....3 years without any more leaks)
Be sure of where you want it because, as Gary mentioned, it is very difficult to remove.