I did a write up on this last summer but havent been able to find the thread, its in here somewhere, either the beach forum or this forum. actually several guys posted about it, one even put a pic up of the can it comes in (from a auto parts store) and I posted a pic of a 10" Tornado coil I hunted most of the summer with that had it applied to and it never chipped or cracked, effected the performance in any way except enhance performance in that you never have to worry about sand getting in your coil cover again, and lastly its a very thin and tough coating, I sprayed mine ........I think it was 4 or 5 coats on the bottom and I could still put the coil cover on(to give you an idea of how thick it actually is). the thing that throws people off is the name, truck bed liner, which we are familiar seeing as a thick rough coating and thats not it at all, its a dull finish but more smooth like a paint yet still very durable. the only reason I havent put it on my excal II or etrac coils is that they are still under warranty and I will wait until that is up in case either coil fails. whether minelab should or shouldnt make that an issue with the warranty isnt a debate Im gonna get into.
sometimes we all just think to damn much about stuff and end up frozen on what we should all do. easy enough to buy a can of it, its inexpensive, and try it on something else, try it on a hammer or a yard tool, give yourself an idea of how you like it, then you will see if its something you should put on your coils. with one can you can easily spray some yard tools and try it and have plenty left to do a coil or two. remember thin multiple coats versus thick coats, just like regular spray paint.
I hung mine one a line outside in the backyard and sprayed it.