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Polyurea Spraying over Geotextile sealing a crack inside a Tank. Spraying an Aromatic Polyurea using a Graco AP Spray Gun made light work of this little project. Blast It Clean It Paint It prepared the surface by abrasive blasting followed by applying a primer with a Geotextile to help provide the bridge cracking required to seal the bottom of the tank. Sandblasting provided the best surface preparation for this tank. Rapid cure provided the perfect solution for this problem. Australian Urethane Systems Polyeuro 5502 was the ideal choice for this repair project on this Sydney Water Asset.