AdCoat Pond, Fountain & Marine Paint - 2-Part Acrylic Epoxy - Interior Exterior - 1 Gallon Kit - Calming Blue Indoor, Outdoor and Underwater Protection, Non-Toxic, Safe for Plants and Fish 2 part epoxy -- water based acrylic 1 gallon covers up to 300 square feet Designed for Concrete, Gunite, Plaster and Fiberglass Ponds, Lakes, Fountains, Aquafarming, Bird Baths, Aqueducts, Water Storage, Holding Tanks