Bridge joints/seams with Liquid Rubber Seam Tape.
You'll want to apply the Original Black Liquid Rubber Waterproof Sealant . Final coverage is approx 20 sq ft per G. So 3 Gallons.
Apply heavy coats until all the material is used up.
You can apply the next coat when it's dry to touch.
Allow 5-7 days of curing before filling. The longer the better.
Fill for 24 - 48 hrs, drain and wipe clean before putting into use.