They have many other designs. One is like the Pontiac one that's multiple panels for one opening. I've installed about 20 by that company, and never had a single problem.
I remove it to regain traction, but I agree that the edge is one of the biggest snot-slingers ever. It's particularly bad with mine being white. That's why I love the ultima. It cures drier than a popcorn fart and stays put.
I always put slime on the tread when I get to my parking spot at shows.
That being said, I use water - based products on the tread and hose them down with degreaser and water before I leave.
These are the ones I'm considering: http://www.parts-express.com/pe/showdetl.cfm?partnumber=264-909
I'll be using an abacus...
I spent 13 years as an engineer. I'm sure I can figure it out.