hi steve,
yeah, I've used PetroPatch on the bottom of an SRX tank. It was fine for 3 years, then I got rid of the tank. I also petsealed the inside mind...
Its just epoxy, which you soak some cottom mat in. Same idea as GRP, more or less.
Will do the trick at least for a while...
see you tomorrow (sun), bout lunchtime!
a