Hope this helps...Here's what Jayco states on page 87 of the 2010 Jay Feather owner's manual:
"Water is a RV’s worst enemy when it enters where it is not intended. Sealants perform a very important function; they must be inspected closely and be regularly maintained. We incorporate many different types of sealants, including butyl/putty, black butylencapsulated
foam, silicone (clear and colored), roof sealant, foam, etc. In general,sealants do not have “set” lifetimes. Varying environmental factors affect the pliability and adhesiveness of sealants.
Sealants can be affected by ultraviolet exposure, air pollution, extreme temperatures and exposure to other elements. Conditions
such as rain, salt, dust and pollution may increase the need to maintain your RV’s sealants. Checking the sealants is considered
customer maintenance. It is recommended that you or your dealer
Inspect all sealants a minimum of every six months. Make sure to check the roof and all four sides of the RV including all moldings,
windows, doors, vents and exterior attachments. Reseal as necessary and at least one time each year as preventative maintenance."
So by "reseal" they don't mean reseal the entire roof surface, just go around and check the caulking. Wash the roof with Spic N Span periodically too, to get rid of the tree sap, etc that can damage seals.
