A bucket of Cool-Seal and a long handled brush is good, inexpensive roof insurance, and the average RV only takes one afternoon to brush on a coat of sealer.
Jerry
If you have a solid roof (not covered with rubber or vinyl), coat it with EPDM Liquid Roof. It's real rubber. It comes in 2 parts that you mix. It's a quick and easy job and it cures to the same stuff they put on roofs in rolls. It'll cover cracks, screw heads, etc.
