You can apply a simple liquid compound such as git rot found at most boating and rv stores.
How to repair travel trailer rubber roof.
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How to clean a rv rubber roof when you do clean your roof you can use the ladder present at the back of your rv to get up on the roof and remove any dirt or debris present on it thereafter make sure that you have rinsed all cleaner off thoroughly after you have washed it.
Apply eternabond roofseal tape.
Simply spray wipe clean with a rag and wait a minute for it to dry.
Measure the area you need to cover cut the tape peel off the backing and apply the tape.
Dealing with small leaks and seals.
Use eternabond spray cleaner to remove dirt and oxidation from the roof surface.
If you have a small leak in your rubber roof or if the seal is just not quite doing the job anymore you can simply use a rubber roof coating to seal over the leak.
In this rv diy video discover how easy it is to repair a punctured or torn rv rubber roof.