newpondsam, I think there are ways (other) to seal this but for questions on ESS-13 call Shawn Walstad, 480-797-7341.
He's a specialist for this company and can answer your questions, and I'm not saying this IS the product to use but Shawn will answer your questions about this product.

EDIT: Just realized this OP was 2 months old.. probably gone.

Last edited by Snipe; 07/30/20 12:32 AM.