Search "gold label aquarium and pond sealer" its a silicone sold by a company called Hutton Products. I had to get mine special ordered through a local pond shop and they didnt even know what it was but found it available in a magazine they had back in 09-10. Very hard to find in quantity but worth every penny. Its like sticky tar/asphault, dries tough and you can even shoot/cure it underwater. Best silicone ive ever used. Very popular on the koi forums.
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