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Old 02-26-2011, 09:23 PM   #1
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Por-15

The underbody of my ride is showing a lot of surface rust. As I am hoping to die owning my jeep I want to keep this from happening. I plan on using a wire brush to remove flakes of rust, a rust neutralizing solution to remove the present rust and POR-15 to prevent further rust/make it look pretty. My question is, can/should I use POR-15 on things such as my transfer case, my axle housing, driveshaft, brake drums/calipers etc?

Also should I POR-15 the bolts under my jeep? Would this make the bolts a PITA to remove in the future??

Thanks guys

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Old 02-27-2011, 08:47 AM   #2
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You may want to check into product called "Rust Bullet". I believe it's friendlier to top coating than POR. I used it on the chassis of my '79 J20, which is my plow truck among other things, 8 years ago and it's holding up great.

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Old 02-28-2011, 05:24 PM   #3
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Any more advice guys??
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Old 02-28-2011, 08:59 PM   #4
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i used por-15 on the undercarage of my 73 cj5, i would say to get the 3 part kit that por 15 has, it comes with a cleaner/ degreaser, metal ready, and than the por15. and this stuff is strong. i painted a piece of sheetmetal and was able to fold it in half and pound a crease into it and it didn't chip or crack. is worth the money
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Old 02-28-2011, 11:24 PM   #5
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POR-15 is a great product, and will hold up well in underbody applications away from direct sunlight. But keep in mind, it has a high sensitivity to the UV rays and will decompose fairly quickly if left out in the open, unprotected, where sunlight will routinely shine directly on it. It is great for use over rusted metal, or something with a good 'tooth' or roughness to hold it. It will not stick well to slick, painted, or shiny surfaces. Be sure and follow it up with a good chassis black or something like that to seal it down and you will have a coating that will last for years. I think POR-15 also makes a chassis black for use over their coatings. The Eastwood Company also makes a good product called Rust Encapsulator, that is more of a primer with excellent rust-inhibitive 'glass leaf' characteristics. (it was originally designed as a paint for oil rigs in the north sea.) It is much more useable for topside repairs than the POR-15 coating, as it is topcoat friendly for painting over it with automotive primers and sealers. It can also withstand more topside light, weather, etc. than POR-15 if left uncovered, because it is not nearly as sensitive to the UV light.
Now. That being said, and completely off the record, there's also a product that many hardware stores sell, that's made by 'sprayon' and is called 'Red Insulating Varnish No. S00601'. It is a rusty red color, and looks similar to many red oxide primers, but with slightly more gloss. It is not marketed as a rust inhibitive or preventive paint. After being told about this by a good friend who is also car-crazy, I have been testing this stuff on some rusty truck, tractor, and suspension pieces for 3 or 4 years now. After just wire brushing and spraying on a couple of coats, it shows no sign of coming up, peeling, or even rust penetration after 3 or 4 years. This is with no other topcoat, and left uncovered out in the weather. It will also accept other paints right over it. Look for this stuff where industrial hardware is sold. Its cost is about $5 per tall aerosol can, and from what I've seen gives a lot of bang for the buck. I've been redoing cars since the early 80's, and have tried just about everything marketed to fight rust. I have to say that this stuff is probably one of the best little-known products to fight rust I've tried to date. Sorry for the long post, but I hope this helps..
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Old 02-28-2011, 11:58 PM   #6
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I would not use POR-15 on any bolts you want to remove in the future. If you put the top on an opened can of por-15 without some plastic wrap in between, the top will "weld" itself to the can. I'm sure nuts and bolts would do the same.
I would worry more about preventing rust inside the frame, that can cause lots more damage than rusty brake drums or driveshafts.
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Old 03-01-2011, 01:04 AM   #7
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How do i go about removing and preventing rust inside the frame rails? There are only very small holes to access the inside...
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Old 03-01-2011, 01:11 PM   #8
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Most people spray some kind of oil or rust preventer inside the frame. I plan on using a pump-up garden sprayer (with a wand sprayer )and spraying BOILED linseed oil everywhere I can reach. It sounds like the boiled linseed oil will dry to a waxy coating that will prevent rust without attracting as much dirt as motor oil will.
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Old 03-01-2011, 01:25 PM   #9
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Quote:
Originally Posted by Ecker786 View Post
Also should I POR-15 the bolts under my jeep? Would this make the bolts a PITA to remove in the future??

Thanks guys
Yes, Yes it will.

As to brake drums, I just replaced mine for $60 total and I believe they may have been the original or turned once in the past. I wouldn't bother with por-15ing them, they are cheap enough to replace and they last a long time anyways.

I am also no sure how the por-15 would hold up to the heat from braking.
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Old 03-01-2011, 09:12 PM   #10
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Quote:
Originally Posted by Ecker786 View Post
How do i go about removing and preventing rust inside the frame rails? There are only very small holes to access the inside...
thats the thing i wish i did when i had some por15 leftover, i had the driver side rail rot away and the crossmember fell on that side, got it fixed and the other day the other side did the same thing, to fix both was a total of $1200 for the repair and the coating of the undercarage
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Old 03-01-2011, 11:47 PM   #11
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I have had very good results with POR15. I use it on everything I need to protect from rust. Regarding the UV, as mentioned, just paint over it with a coating resistant to UV and call it a day.
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Old 03-02-2011, 09:52 AM   #12
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That is correct. Be sure and topcoat over it. But also read the fine print. A topcoat will adhere best if applied about 10-12 hours after the por-15 has been applied. Topcoating after the POR-15 has cured will require sanding or 'roughing up' the por-15 surface.
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Old 03-02-2011, 11:16 AM   #13
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This is what I plan to do for the inside frame rails. I've read many good things about this product:
Internal Frame Coating w/Spray Nozzle

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