so you're using this to heat multiple tubs? i would have just gone with a nice strip of 4" flexwatt. then you could just lay it down and put the tubs right on top. no sticky stuff to mess with.

but since you got it mine as well use it. i have like 3 of them just laying around here cause i have no use for them anymore. you can leave the paper over the sticky part and just aluminum tape it to what ever you are attaching it to. it's not gonna melt the plastic, it doesn't get that hot.

well good luck with it.