Hi,
I put on Herculiner, it was a bit expensive, but makes the roof very tough, slip resistant, and one peice!
There is also some two part products, that will not disolve (like water based 1 part products when they have standing water on them for more than a week) such as the Liquid Roof EPDM product that does not flake off like the factory installed roof product.
The flaking keeps the outside looking white, yet leaves behind white particals on the RV siddewalls.
Here is a link to my post, it has links to the two products that I mentioned.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/24993453/srt/pa/pging/1/page/1.cfmFred.
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