Do a search on a product called RVarmor I believe. It is a proprietary roof coating process that is $$, but has a lifetime warranty I think. Worth a look to see if it would be a workable solution for you.
Search the Sunseeker site for the same problem. I think FR paid for the repair at RVROOF.COM
I watch mine very closely and if a problem starts that is where I am going.
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2014 Sunseeker 3170 DSF
Dorothy, Garrette and Miss Bella.
Retired and having fun.