rubber spray sealant on roof

silversand wrote:

The Airstream and one Bigfoot were used when I bought them (a couple of years old) the others were new. Within 2 years of manufacture the Dicor was failing on all 5. I would call that 100% abject failure...

This could be because of cheap Chinese knock-off product creeping into the industry (or, it isn't Dicor: read the post above). Buy your sealant directly from Dicor, if you want to be absolutely sure it is the real thing (and not stale!). And, as your camper manufacturer precisely what they had used.

I have no way of knowing what the actual material was. But I did ask both Bigfoot and Monoco directly, and was told by them it was Dicor. I didn't ask Airstream, but the stuff looked (and failed) identically. In addition, almost any 3+ year old RV roof I have looked at that has this type of product has signs of failure or complete failure. Now this is California where the sun shines a lot. This stuff turns hard and brittle over a fairly short life. Up north or back east with not much sun, maybe it lasts longer.

Drizzling stuff on the outside of a joint isn't really a great way so sealing anything, though it is easy to do. Kind of like putting the valve covers on you engine dry, then wiping sealant around the outside and expecting it to keep the oil in.