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Old 10-28-2010, 05:01 PM   #1
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does undercoating stop rust?

My dad just bought a used truck '01 ranger that has some rust on the underside and a small area on the bottom of the door. Will undercoating stop it from going any farther, or is there something you know about that will stop it?
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Old 10-28-2010, 05:06 PM   #2
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It will slow it down, rust never sleeps. POR 15 may be better, or Naval Jelly first then zinc oxide primer followed by paint then undercoating.


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Old 10-28-2010, 06:18 PM   #3
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Once the rust has settled into the body seams the only option is an oil spray. Undercoating over rust will make it worse.
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Old 10-28-2010, 07:16 PM   #4
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Undercoating isnt worth a crap except to reduce road noise. Por 15 is your best bet for a protectant, there are other brands out there as well if you want something different.
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Old 10-28-2010, 07:29 PM   #5
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Undercoating is a crock of ####.

Every vehicle that I have seen with "undercoating" and "rust prevention" are all rusted to ####.

Usually all that stuff does is trap the moisture and MAKE rust.
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Old 10-28-2010, 07:29 PM   #6
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It will slow it down, rust never sleeps. POR 15 may be better, or Naval Jelly first then zinc oxide primer followed by paint then undercoating.


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+1. It has to be coated from the get-go to pe particularly effective. I had an 87 Tbird that was Rusty Jonesed and that chit was rust free.
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Old 10-28-2010, 07:33 PM   #7
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The analogy that comes to mind is putting Sunblock on a sunburn.
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Old 10-28-2010, 07:39 PM   #8
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There are rust converters like Eastwood's sells:

http://www.eastwood.com/rust-solutio...converter.html
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Old 10-28-2010, 07:41 PM   #9
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I had a line truck out of PA. It had 250K on it when I bought it and it was treated for rust, Rusty-Jones competitor, Zeibart. It still had a great body at 400K when the 400M gave up.


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Old 10-28-2010, 08:00 PM   #10
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I use a product called Rust-Mort that converts the rust, then I POR15 if its a frame, or prime and paint if its a body panel.
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Old 10-28-2010, 08:54 PM   #11
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Quote:
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Undercoating is a crock of ####.

Every vehicle that I have seen with "undercoating" and "rust prevention" are all rusted to ####.

Usually all that stuff does is trap the moisture and MAKE rust.
This. My 63 Nova is rotted, it has undercoat on it.
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Old 10-28-2010, 09:06 PM   #12
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The oil spray type products work the best imo.

My 89 would have likely become a rust bucket years ago without it and I haven't oil sprayed it for several years now and it's always winter driven in Canada.

The underside is black from all the previous applications.
No sign of rust that I can see.

Heres a Canadian company that's one of the best out there.
http://www.krown.com/#default
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Old 10-28-2010, 09:41 PM   #13
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Once the rust has settled into the body seams the only option is an oil spray. Undercoating over rust will make it worse.
What the Canadian guys said.

Oil spray is the best, but you won't get that on this side of the border.

Undercoating works if done properly before the vehicle has seen any road duty or gotten wet. Most undercoatings will harden and crack after a while, making them virtually worthless after that.

Once the rust has started, POR15.
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Old 10-28-2010, 10:21 PM   #14
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Oil spray is the best, but you won't get that on this side of the border.
Tranny fluid cut with WD-40 works just as well. Use a pump style garden sprayer with a wand to get into the door panels. It does smell for a while though. The stuff the commercial guys use doesn't smell at all.

Don't spray it on the exhaust.
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Old 10-28-2010, 10:24 PM   #15
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Tranny fluid cut with WD-40 works just as well. Use a pump style garden sprayer with a wand to get into the door panels. It does smell for a while though. The stuff the commercial guys use doesn't smell at all.

Don't spray it on the exhaust.
I use bar and chain oil mixed with clear coat. Looks great when done.
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Old 10-29-2010, 12:06 AM   #16
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When using an undercoat make sure the stuff contains asphalt.
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Old 10-29-2010, 01:18 AM   #17
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undercoat only works to prevent rust if the area sprayed has no rust to begin with. Undercoat over rust makes it worse. Rust needs oxygen to oxidize, so the key to products like por-15 is that they dont let air in...
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Old 11-08-2010, 05:36 PM   #18
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Quote:
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I use a product called Rust-Mort that converts the rust, then I POR15 if its a frame, or prime and paint if its a body panel.
POR15 is actually supposed to adhere better if you leave the (not loose) rust in place. I did their 3-step process to a machete which I routinely use during the summer months at my folks' cabin for gathering firewood and its held up extremely well over the course of about 5 years. Literally the only place where the POR15 has come off is where I have used a bastard file (right along the edge) to sharpen it a couple times!
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Old 11-09-2010, 01:21 AM   #19
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Tranny fluid ....

Don't spray it on the exhaust.
Reminds me of when I lived in Ont. One of the guys I worked with told me about a job he had in college, it was an electronics service/tech/repair job in Toronto. They had an old van with a big V8 in it that he never drove, except for one time when the one he usually drove was in the shop. His boss told him "just ignore the people waving at you, get a lot of that with this van". He did too. Said he came to a stop light, and someone yelled "your van is on fire". Turns out the tranny had a pretty good leak, and it would drip onto one of the cats and there would be very visible flames. He was really pissed at his boss for not telling him about that when he got back.
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Old 11-09-2010, 01:33 AM   #20
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Undercoating = Rust promoter
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Old 11-09-2010, 01:42 AM   #21
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Reminds me of when I lived in Ont. One of the guys I worked with told me about a job he had in college, it was an electronics service/tech/repair job in Toronto. They had an old van with a big V8 in it that he never drove, except for one time when the one he usually drove was in the shop. His boss told him "just ignore the people waving at you, get a lot of that with this van". He did too. Said he came to a stop light, and someone yelled "your van is on fire". Turns out the tranny had a pretty good leak, and it would drip onto one of the cats and there would be very visible flames. He was really pissed at his boss for not telling him about that when he got back.
I would die laughing!
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Old 11-09-2010, 09:53 AM   #22
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The analogy that comes to mind is putting Sunblock on a sunburn.
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Old 11-09-2010, 10:43 AM   #23
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POR-15.
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Old 11-09-2010, 10:52 AM   #24
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I would die laughing!
It was good humor. There was actually a bit more to the story, like the leak varied with speed, and keeping the van over 60 or 70 on the freeway because it was fast enough to keep the flames from doing any serious damage. But I don't recall all the details now. It was 20 years ago that I worked with him.

Same guy had a strategy for dates. Don't recall the exact amount anymore, but somewhere north of $75-125 spent on the night would guarantee getting laid. I think the price on Younge St. was a bit less at the time, but to each their own.
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