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New concrete leaches alkali, creating pH and water chemistry problems for fish. With Herco H-55 you can seal and leakproof new and old concrete, block and brick.
H-55 can be brushed, rolled or sprayed with an airless gun in two or more coats (one hour apart). One gallon covers approximately 100 sq.ft. After a 72-hour cure period, fill with water and stock with fish. Herco thinner is required for clean up and/or product thinning. Primer is not necessary but highly recommended—we cannot guarantee this product if used without primer. Herco caulk crack filler is another excellent concrete product that comes in a 12-oz tube. Made in USA. Ships Hazmat.