Sealant for plywood tank

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RubenFitton1

Feeder Fish
MFK Member
Sep 13, 2017
7
1
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22
South africa
Hi all, I am in the process of building a plywood tank, and was wanting to know, will a sealant That is bitumen based, but safe for koi ponds and potable water be fine for fw rays
 
If its good for potable water it will be fine. How does it hold up over time? Have you seen an long term use of the product? Those would be my concerns.
 
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