I know camping world sells repair kits. Eternal tape is used to seal seams, so I imagine it would work here as well. Someone will come along with a definite answer though. In the mean time check out camping worlds website on roof repair kits.
Just a note on the etherbond tape. I used it last year with poor results, I determined I applied it wrong. I used it on the edge of the roof, where the roof transitions from horizontal to vertical. After a few months of head scratching (electrical tape worked great during this time). I reapplied the tape, and it has worked great ever since. What I did wrong the first time was to stretch the tape, as I rolled it around the edge.