Will there be liner under the stone grubber?? If there is then I would say
you need to use the sealing tape to make a waterproof seam in the liner. Our
stream is completely lined with liner. We have 3 mirror stones set in with
eddy's (small pools) underneath. The foam alone will not make a completely
waterproof seal. We do have a very small amount of water that leaks
underneath the mirror stones. It does seal over the season with debris and
sludge....
Janet in "0" visibility snowy Niagara Falls! O

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"grubber" wrote in message
...
Thanks for all the replies.

But I'm not trying to seal liner together. I have a very large flat rock
that is mostly buried. The downslope edge hangs out a little over a 6"
drop. I want to dig back further under the rock to form a small pool
under
the drop. The stream would flow over the rock, fall into the pool below
and
then continue on its way. The pool would have a liner bottom.

My basic question is, "Is it possible to make a waterproof join between
the
pool liner and the immovable rock, and if so, how?"