Hello, Bought a used 2005 starcraft last year. Getting it ready for this summer and notice some cracking along the edges so i decided to use eternabond and tape the sides. While looking at roof im ...
The white coating is just a covering (sacrificial) for the actual rubber (EPDM), You are most likely in good shape as far as water intrusion as it appears from what I'm able to make out is cosmetic.
You've taken some good steps by sealing the edges, and checking all areas that are caulked.