Originally Posted by Gary RVRoamer
Odds are heavy that the TPO is still fine and any leaks are at the edge seams or around openings (vents and such). You should focus your efforts on those areas rather than covering the TPO sheeting. The TPO itself won't leak unless something poked a hole in it. I'd clean and recaulk the edges and openings, or apply Eternabond (or similar roof tape) there. Then you can coat over that if you like.
I was hoping the OP would post a picture. But I thought from reading this thread and another thread he started on the same subject, the roof is plain metal without any coating, just riveted. Similar to an Airstream product and fiberglass front and end caps.
There is some confusion as someone posted that he (not the OP) has a TPO roof. See post #3. I'm not sure what that is all about.