Question regarding lap sealant

jbres wrote:
yea sorry what I used is "self leveling sealant".. Can anyone fill me in on the difference between the "lap sealant" and "self leveling caulk"? If I don't use the eternabond, what type of sealant should I use that will seal the entire 2" span?

A lap sealant is a sealant that is used for sealing two surfaces, one of them overlapping. A self-leveling sealant is one that has low viscosity when applied so that it can spread over an area before curing.

I know at least Dicor labels their product "lap sealant" and it's primary use on RV's is to seal other areas, much like a caulk where two surfaces meet. In the traditional definition of "lap sealant" it isn't being used as one.

The OP doesn't believe Eternabond is better (I was there once) so the best sealant to use to cover a 2" mess of sealant is Dicor self-leveling sealant. To control the added mess created by spooning more sealant over the spread area, you could tape or cut the unwanted off.

FWIW, I come from a construction trades viewpoint on sealants and never saw the kind of sealing process that was done on an RV roof until recently. I've seen a lot of pictures in this Forum of vent->roof joints, around vent stacks, and on the front or back wall->roof joints. The sealants must have been applied with a machine assisted gun applicator and the excess sealant used is probably to insure adhesion to the surfaces. But what a freakin' mess. There really is no reason to have 1/2" of sealant piled on top of a joint. The usual maintenance procedure is then to get up there and spread more across the top, trying to seal small cracks or edge areas that have come loose.
I don't have a rig with these furrows of sealant but if I did, I'd be up there pulling it off and replacing with an adequate sealant, probably Eternabond because it works so well.