Savio Black FoamSavio black foam is used to fill cracks in rocks for enhanced waterfall appearance. Easy application Multi purpose Durable 16 oz can
Tierra Innovations Rockin FoamFinally an excellent foam product specifically designed for Water Gardening applications. Tierra Innovation's Rockin Foam was designed by professionals in the industry. Minimal Expanding Foam -...(click on product image for more details)
Fills in cracks between rocks for improved waterfall appearance. Dries to touch in 10 minutes and cures in one hour. Large 20 oz can.