Waterfall foam cans in DIY ready to use versions. We also stock professional foam guns to allow more use and control. The black pond foam sealant is easy to hide. Used for making water go over rocks in streams and waterfalls instead of under the stones.
Black waterfall foam sealant works great for foaming joints to create a more natural looking spillway. Simply butt the rocks up to the spillway and then foam in the cracks. As the foam starts to dry and is tacky you can add gravel and small stones on top of it. You have to time this right though. If you were to do it too soon the stone will fall right into it. Wait too long and it will not stick. A couple minutes is all we usually have to wait. You may want to experiment a little before foaming in your water feature. Find out how much the foam expands and also how fast it dries.
You can also use waterfall sealant foam to "glue" on a piece of flagstone to create a simple spillway. Simply tilt the flagstone forward and place the applicator under the stone, and then dispense the foam. You won't need a ton on these types of stones since they are large and flat and it's easy for the pond foam to bond with the liner, or spillway.
Cascades, or rapids style streams will use up the most foam. The odd shapes of the stone and bigger voids and it becomes more important to use enough foam to create a good bond with the liner.
In large gaps where it would be costly to fill the entire void with expandable foam simply fill it most of the way with stone. Then use the foam and follow with stone again to hide it.
When foaming a waterfall it is a good idea to dry fit all stones before applying any foam. Once you have the look you want just reverse engineer it and start using the waterfall sealant from the bottom up. Foam in one layer, then place your stone, foam, stone, and repeat as needed. You will notice the foam expanding and may need to trim it when it becomes dry if you sprayed too much.
Before you do any of this though, be sure to wear disposable rubber gloves. As black pond foam is hard to get off your skin and the chemicals should be avoided from skin contact as well.
Pro tip: While the waterfall foam is wet you can throw rock dust, or sand on it to give it a more natural look.
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