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Yes, Tank Sealer adheres very well to itself.
Because you tested the tank with water (Good Job!), all you need to do is dry the tank well. If you had introduced fuel or anything other than water to test for leaks, then you would simply need to clean out the residue in the tank with KBS Klean and rinse with water before drying the tank well.
Apply another coat of Tank Sealer following the directions being sure not to let the Tank Sealer puddle or get thick always draining out the excess. You can buy the Tank Sealer alone here 👉 https://www.kbs-coatings.com/tank-sealer
As always, carefully follow the directions so you achieve the success you desire 👉 https://www.kbs-coatings.com/tank-sealer-directions