Fiberglass liners are fine for bogs and ponds. They are fairly commonly used and have a number of advantages (such as durability) over other materials. There is nothing in the material that should hurt a bog or a pond.

BTW, I love your screen name. Just the name brings up all kinds of neat pictures in my mind.

Thanks brandon7,

Our farm is on a ridge with creeks on either side & every morning when I take my walk?....Yep! A joy every morning, almost.....

Thanks for the info...our bog is going to lie above & drain into the pool& into a stream & would take more liner than we can afford. Delighted with your reply

Sally

Hi Sally,
When you say you'll line it with fiberglass do you mean a preformed shape or do you mean you'll put the fabric down and then put the resin on top?
I did it with the resin a number of years ago and it worked great. My only problem was a slight leak that I never could find. I think it was from a combination of my own inexperience plus being stingy with the resin and not putting down a healthy enough coat. Good luck!