Here are the replies I recieved:
I've used similar products and Zero Rust (Not sure that's the correct name
but the Zero part is right.)
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I have used the Eastwood product and it did beat rust down. It is called for
in applications where the rust cannot be removed. I feel better grinding the
rust down as completely as possible first and using the POR15 system.
Following the steps carefully is very time consuming but once I did skip the
chemical wash and etching steps (the kit used to come without these items) and
the rust did return.
It is very helpful to have a coffee ladel and heat gun when using POR15. The
ladel is because you don't want any of the paint that you remove to return to
the container. The heat gun because after the rinsing and etching the metal
must be completely dry. If you get any of the POR15 paint on your hands it is
a two week tattoo. So use gloves.
Here's the POR15 website: www.por15.com
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I've used this product and love it! I still have some test pieces out in
the weather and the coated sections are still rust free. Good stuff.
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I used this on a Datsun Pickup project a few years ago. A little too
soon to know if it works better than Rust-oleum, but it went on fine,
covered well, smoothed over rust pits okay. Awfully expensive though.
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Eastwood sold POR-15 when it first came out and then switched over to
another brand. I can't speak for the new brand but I used POR-15 and
associated products with outstanding success.
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I poured it inside my frame to seal it off after I had it sandblasted. I
don't really have any history of how it lasts or anything--the rolling
chassis is still in my garage.
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I have used it on my roadster. I had great success on the interior section
of my car, and wherever their was some minor surface rust. It bonded well.
I had a problem in the engine bay area. I did not strip it down completely.
Instead, I just cleaned and scuffed the paint. It seemed fine, but when we
began the actual priming and painting, it began to peel. So I am guessing
that it is better suited to bonding of metal, than a painted surface.
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