I have heard horror stories about sprayed Line-X type coatings peeling away in the middle of a drift after hitting a rock. It was relayed to me as trying to row with a piece of plywood attached to the bottom of your boat. Adhered UHWM gives me the creeps for the same reason. No thanks

I have followed buddies through tailouts on the same line, his boat had Coat-It where I drew more water because of the thickness of the UHWM, I had to walk and he didn't. Coat-It works just as well.
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In the legend of King Arthur, the Fisher King was a renowned angler whose errant ways caused him to be struck dumb in the presence of the sacred chalice. I am no great fisherman, and a steelhead is not the covenant of Christ, but with each of these fish I am rendered speechless.