[Paddlewise] Slippery kayak cart

I just built a cart for wheeling my kayaks onto ferries.  The cart uses 
an "+" shaped saddle, where the cross-piece is curved to fit my kayaks 
near the bulkhead (surprisingly, even though the kayaks are quite 
different, the curve of the hull near each boat's bulkhead was very 
similar), and the longitudinal piece is flat.  I lined the saddle with 
that blue closed-cell foam which I think is called "Ensolite" (the stuff 
used, AFAIK, only by young male backpackers for sleeping pads). The 
saddle fits the boats quite well.  Here's the problem: after giving it a 
test-spin, deliberately trying it on small curbs (maybe an inch or two 
high) at various angles, the darn thing slips where it attaches to the 
kayak, even when I cinch the strap that holds the kayak to the cart 
quite tight.  To my surprise, I found that the Ensolite foam is a little 
slippery when wet, which seems to be the bulk of the problem. 

So, does anyone have any suggestions for some kind of coating that I 
could paint on the Ensolite that (a) will stick to it (some glues, for 
example contact cement, don't adhere to it very well -- although 
polyurethane sticks quite well); (b) will provide enough friction to 
keep the kayak from slip-sliding around on the saddle, but without being 
"sticky" (in other words, I don't want dirt or debris sticking to it); 
and (c) will remain flexible.  One idea I was considering is 3m 5200 
marine sealant, though I'm not sure it would remain tacky enough.  As an 
alternative approach, I could glue some kind of tacky material to the foam.

Any ideas?

Evan Dallas
Woodinville, Washington
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