differnce in plywood

[pelican]

Originally Posted by 77SceptreOB

How is Polyester resin any more or less pourous than Epoxy resin? Neither is "pourous" as I see it. These SeaCrafts are built primarily out of Polyester resins and are Very water tight. Please explain. Comments?

epoxy is completley waterproof - it will adhere,no water

polyester resins are pourous - these will allow small amount of water to be absorbed,and passed through - the reason a boat's bottom is epoxy barrier coated - to assure no water is absorbed by the hull...


when bonding a glass - fiberglass to wood - polyester resins,they provide a surface bond - due to the fact,they will not fully "soak" in the wood

epoxy,with it's long kick time,and the fact it's waterproof,it provides a stronger,much more reliable bond,when glassing to wood...

epoxy has a much longer kick time,versus polyester - longe cure,stronger bond...