I've used POR on some test metal (an old car out in the field), I lightly brushed it with a steel brush, then put on the POR-15.  The metal was VERY rusty.  Two years later out in the weather it looked more or less the same.  The POR had changed colors, but was still there.  I've also applied the POR Patch to Paper Towels, then filled over rust holes for a temporary measure.  It acted like thin sheets of fiber glass when done.  It lasted for years (so much for temporary, LOL).  If you aren't a stickler for 100% perfect, just use the POR-15 patch, and some paper towels, then POR the rest of the roof, and you'll be ok for years.  Probably longer than most people keep interest in an old car.
 
Later
Charles
 
----- Original Message -----
Sent: Tuesday, November 01, 2005 6:20 PM
Subject: Re: [Chevelle-list] Good enough for POR15?

pk let me ask i bought my son a 72 nova it is in great shape other than the roof (from the old vynil top) we want to paint the top i was wondering if anyone used the  por-15 on heavy rust what cannot be grinded out and replacing the top is out of the question ,i thought of por-15 then a new vynl top but with the color we ant to use it wouldn't look right ,so i was wandering if you can por 15 iot then maybe epoxy prime it then fill the rust crators then prime and paint or will it just bubble back up after a year or so

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