So like I said in my last post I bought 4 of the 18x18 Kane mat for $30 each at a moving sale which I'm stoked about but I never opened any of them to check them out bc I'm waiting for my vision cage to arrive. Well I decided to open one since I was bored and I see on the mat and paper that is says DO NOT COVER THE HEAT MAT WITH ANY FOREIGN MATERIAL. So your telling me I can drag this through the mud and throw it in a lake and still use it but can't cover it with substrate? It also says on the paper do not have any foreign material within a 10' radius. So I would have to have a gigantic enclosure with no substrate to use this? They clearly state for use with pets, small animals, and reptiles but any way someone could use it voids warranty unless you want your herps to have nowhere to hide. I'm sure that its all just to cover there rears but basically anyone who uses one would be in void of the warranty unless they have an enclosure with nothing in it. But basically my question is has anyone ever experienced any problems with covering the mat or having substrate near it? Sorry most of the post is me venting Lol they make this awesome heat mat and then tell you warranty is void if anything comes near it. Am I missing something?