Pond Shield is a non-toxic epoxy liner designed for the pond and water feature industry. Created to construction water features or ponds with a more designer, formal or natural look than rubber liners
www.homedepot.com
i'd keep looking for a polyurethane coating that is fish safe
i did find A company i have worked with before called Tremco but i could not find if it was fish safe but i would still highly recommend watching the videos they have. They show the best procedures to coatings
if you can find a fish safe product from Sika they are experts in coatings
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