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Anyone ever use this? I've got some rust spots on my frame (shocking, I know). There is some undercoating on some of the frame and less or none on other spots. Can I just hit the rust spots, should I coat over the spots that already have undercoating? What underneath should I NOT cover with POR -15? Leaf springs, shackles, suspension or steering parts? '93 YJ 4.0 5sp
 

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I used it on my rear axle. I was going to use it on my frame but I had already primed it and they say it can not be used over paint (and I presume undercoating). I would clean out from the rust spots until you get to clean metal, then coat the rust and clean metal areas with the POR-15. I would not use it on anything threaded that you want to adjust later, or suspension parts that flex (springs) but only because I think of it being to brittle to flex which may be wrong.
 

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Por15 works great on rusty/seasoned metal if its clean metal it will not stick very well.

I just used some of it today to touch up my warn rock sliders before i herculine them. I wanted to remove all of the powdercoat but aircraft stripper would not remove it. Por15 only stops spread of rust if its in direct contact with the metal. If you paint over paint that paint will eventually peel and fall off and leave the metal exposed.

por15 goes a long way i just bought another 4oz can today, ebay was out so i ordered it off amazon for $9.99 free shipping. My frame still has 95% of the factory paint on it with a little surface rust here and there. I am planning on cleaning it really well hitting it with some sand paper to rough up the old paint and just going over it. Since i do not want to strip all of the old paint off. If it starts peeling i will just hit the problem spots to touch it up.
 

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Thanks. I'll give it a try
Use a wire brush and clean any flaking rust scale off. Stir the por15 with the handle of a plastic fork or a chop stick or something. Pour some of it into a separate container like a old clean butter bowl. Never paint directly from the can unless you are going to use it all. The can is small but it goes a long way when your done put the lid on tight and store it in the refrigerator for next time. And do not drip any sweat into it it will ruin it.
 

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I go a different route with rusty frames and use Chassis saver. Painted on with a brush.. Did the entire frame, gas tank skid, skid crossmember, and rear bumper I made, with 1 pint... 2 1/2 pint cans. Stuff is surprisingly badass. Had to go a little thicker on the smoother bare metal but it covered great on the rusty spots. I've used both... I like POR with clean sandblasted frames but for rust coverage or local touch up and sealing I actually prefer the chassis saver. ... And yes in the picture those are grind and cutoff wheels holding down the shop towels I used to keep the stuff off the driveway :) the stuff is nasty. Lol
 

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As said....don't get it on your skin. If you are applying it to clean bare metal you need to use the POR15 metal prep. I would recommend using the metal prep anyway. You can watch the rust disappear in front of your eyes with that stuff. I did not use the prep on my Jeep frame and it is peeling in some of the areas where it was on very clean metal. I coated absolutely everything on my truck build and will continue to use the stuff it works well. Also, don't forget to top coat it as it is not UV stable. Any old spray paint will work for that. Did I mention to not get it on your skin? :)
 
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