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Re: [T3] Fiberglass resin under primer


Sounds like a poor-man's POR-15.

Most polyester resins are porous to some degree.  This
MAY slow the rate of O2 reaching the steel to oxidize
it, but it won't stop it entirely.  An epoxy
fiberglass resin will have much lower porosity, but
they're generally much more finicky to deal with, and
many require heat to cure completely.

POR-15 and some similar products are, essentially,
epoxy resins with very low porosity.  If no oxygen can
get to the steel, there's no rust.


  

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