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Is it correct to say that if you completely cut off the flow of oxygen to the rust, the rust will not progress? If that's true and these products (POR-15, Rust Bullet, etc.) completely cut off the oxygen, then maybe they really can do what they claim. I'm a bit skeptical although I just coated my floor pan with Rust Bullet (a POR-15 competitor). -----Original Message----- From: James Montebello [mailto:lapuwali@yahoo.com] Sent: Tuesday, April 26, 2005 5:10 PM To: type3@vwtype3.org Subject: 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. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~