I have a small water garden - 250 gallons - with an approximately 20
gallon "upper pond" with a spillway to form my waterfall. I want to
"cement" a flat stone across the top of the spillway to form the first stone
in the waterfall. Any suggestions as to what sealant I can use? It is only
about 6 inches wide, and I hate to waste an entire can of foam just for
that. Whatever I use will have about a month to cure before any water
touches it. Any suggestions will be appreciated.