Reason why I want to coat the whole roof.... there are too many repair variables (spots) in play. It would be a lot less to worry about in the coming couple of years, if we could just coat over it again
Yes, that would be great but none of the roof coating products will guarantee against a through hole leaking. That's because coating the roof doesn't seal those areas. BTW, elastomeric roof coatings are primarily made for EPDM sheet (may be the same as your RV). Being "RV rated" is a drop in the bucket to the total EPDM market.
The exception to the "Miracle in a bucket" coating is bedliner and some shops are doing it right. Your EPDM sheet is removed and the spray on liner is applied. They guarantee it for life. It is very expensive.
I'd suggest hat you seal any through holes with Eternabond tape and then apply a coating that doesn't have any silicone. This will be the longest lasting maintenance to your roof.
