The guy who runs that KeelEazy operation is Chris Mitchell. I think he is sort of a one-man operation. I suspect he will get back to you, eventually. There's no reason I think that other than he is a small operation and he could be traveling or something.
What I have read about KeelEazy is that the adhesive doesn't go all the way to the sides of the strips, and that they expect the glue to squeeze out to the edge during application. Maybe that can be done in a perfect manner, or maybe there is always going to be some voids along the edge. I expect there are voids in your application, and that is all that sand and water need to start working the edges. Like you say, lateral forces on the beach... pretty soon your KE is hanging off. I've never applied it, so this is just based on my reading about it.
Seems to me you have to make sure the edges are really nailed down, and it wouldn't hurt to have a bit of material extending beyond the edge of the KE that could be feathered to prevent sand from grabbing at the edges when the boat is pushed sideways. I expect that if you are going to go to that length, you'd be just as well off epoxying fiberglass tape onto the hull instead of KE.
Canoe Pack Liner
Canoe/Kayak Storage Racks
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