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Having tested it on my beater truck, it seems to
prefer to go over rust, if you read the directions bare unrusted metal needs
special preparation and any place you use it you need to use their etching
cleaner on it.
I have a beater '50 Chevy (a $200 car in this day
and age is cheap no matter what it is) and I used some around the windshield
channel to see how it worked, since that area on those cars is prone to
rot. When done I'd use the rest of it up on the inside of one of the
doors.
I noticed a while back some bubbles of rust under
it above the right A-post, I need to investigate and see why that is.
Otherwise it seemed to be fine. Applied on painted spots, though, once dry
you can peel it right back off.
I also painted a few spots on my truck with it,
just single coats, and they seemed to hold up okay except at the edges where the
rust was creeping back under it. Here again no prep, just using up the
tail end of what I'd poured out. That after a good salty Syracuse
winter, on a truck I pretty much never wash. I think if I took the time to
wire brush everything down, take it to bare metal at the edges of the rust
spots, and coated everything first with POR-15 then regular paint, it would hold
up a good long time.
Trouble is, it's not worth the quart of POR-15 on
this truck when I have a bunch of 25-cent spray cans of auto spray paint I got
at a car show somewhere, I can just go over the rust with them each fall and
that seems to do just as good a job.
Bill K.
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