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The other day, I'd spot sanded a couple of surface rust spots, got them completely clean, and sprayed over them with rustoleum primer. Came out today and found rust beginning to seep through the primer! What can I do to stop the creeping crud? Enamel over the primer immediately? several coats of primer?

a rust encapsualtor like por-15.. look on Eastwood's website

If you are going to spray anything and really want to stop the rust....use phosphoric acid. Get it by the gallon jug (Ospho Brand...ace hardware). Wash the dirt from teh underside....and the big chunks of rust if you can....then let it dry for a couple days. Spray it on....let it dry 24 hours....repeat. It converts any rust it can reach to black oxide...premanently. It will rust no more.

if you want a clean non rusting surface, is to strip that surface. Muratic acid will totally dissolve all rust it contacts. But...very quickly afterward, it will surface rust over again. Thats good...because now, all of the crusty rust will be gone and the rust will be a thin uniform thickness. Then brush or spray on Ospho...and overnight, it converts that to an oxide of iron. It makes a very good primer for painting. It leaves a mottle bluish black surface. Clean excessive crusty white residue off with any basic clean drying solvent...like acetone...or acetone and xylene mix so it does not flash off so fast. 90% isoproipyl will work too. Thn...paint it. Unless you gouge through teh black oxide, it will never rust again.

Wow... I'm impressed Will work on that tonight

Damn!!! Much better info than I had..
Thanks PapaG... sounds like a better fix for my early stages rust on my floorpan.

i don't have anything aganist POR-15 or any of that stuff. I have even used it. It is just kind of expensive. You would want to top with a good primer. Expoy primers would be best. Then whatever you want on top.

NOTE:

Regular Primer will allow water to seep into the metal. Bondo contains talc (like baby power) it is a sponge for water. Top coat them with some paint, even it it's Krylon or something. Don't worry about having it painted later as a pro will want to sand it anyway at the very least.

Richard

I like using the items you mentioned as it sounds like a more permanent fix. My rust has just gotten to the stage where it is bubbling the paint on the floor pan, so it's not bad yet. Just needs cleaned up and treated and that should be the end of it. I've used POR-15 and those types of products but the rust always seems to come back a little over time unless you can keep a solid topcoat on it permanently.

Great info guys! And sounds like what I want to do. You must be a body man I'm more of a... welll... Start up type person, don't really have a specialty yet. Anyhow, where could I get some muratic acid? Other than sandblasting, I'm not sure how to clean rust out of the pits in the steel.

wire brush or wire wheel

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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras 00' Civic beater...

If you cant get it from a hardware-lowws-homedopot store. Any industral chemcial store should have it. Check the local yellow pages. Not a pro body guy. Just been working on stuff for 35+ years. You tend to pick up a few tricks.

Yup wire brush, dremel even dental picks too. All good stuff to use, can't get a sand blaster in all places. Lots of places, body seams and such that rust will find its way into.

Richard.

Um, watch them wire wheels, they tend to shoot at ya. Short little pieces of wire stuck in your skin really suck
-ret

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1980 4X4 LUV daily driver, as stock as can be.

I'm sold on ospho at ACE, but give it more than 24 hrs before coating it. Seams like 72 and it's ready. I wish I took a before picture. But I just sprayed my bed with the wal-mart bedliner in a can and it's like a new bed now. I also sprayed as best I could the underside of my truck with the ospho.

You betcha baby.... Eye protection!!!! I ware long sleeve shirts when I am doing this stuff. Blue jeans too. Now I am a guy that wore long pants once 2 years ago, and 3 times this year because of weather. Long sleeve shirts and blue jeans, are easy to clean all that bondo, saw, sanding dust off. Wear dust masks at least. Some chemicals you need special stuff.

During a slump in my working life, I worked for a VERY BIG exterminating company.... You will never see me doing anything like that or most other things with out a OSHA approved mask for what I am doing.

Anyone see those working man kilts? That is what I call living life free

http://www.utilikilts.com/

http://www.kiltmen.com/

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75 Luv, 350 V8, TH350, Camaro rearend. New 1975 Luv Step side. Stock for now.
Grandmaster of the "Shade Tree" way.. I can't see the yard for all the cars. Come on down and we will sit on the porch and watch the grass grow.

LOL I need a kilt!!! I want the camo one.

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'78 1.8L 4-speed Fleetside

The only thing more beautiful than a sunset is a sunrise.

Anyone know where else to get the acid. I have tried all the hardware stores and cnat find it. Had a guy look it up at ace and said that he couldnt order it anymore. I went to pro paint shop they had this stuff called rustmor but it was 60 bones for a gallon. It was 75% phosoperic acid but I want to keep looking before I drop that much. Somone said that lowes had it abut it was called Kleean Brite or something. I guess just wanted to see if anyone had problems getting there hands on it. Of course Im in Cali so the hippies probably jacked it up some how.

I've yet to see rust come thru the cheap wal mart paint

http://www.ospho.com

Smaller Quantities can be found at some:
ACE Hardware Stores (Check ACE Warehouse if local store doesn't have it)
True Value Hardware
Do-It-Best Hardware
Handy Hardware
Orgill, Inc.
Sherwin Williams
Duron Paints & Wall Coverings
Lancaster

i've picked up phosphoric acid at home depot before found it in lawn and garden

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I'm one more LUV away from divorce! at least i don't have to worry about her taking them

Must be a Cali thing, I work for ACE and looked it up in the computer and any ACE should be able to get it, my store actually carries both the qts and gallons of it.

The ACE numbers for them are

13867 for the quart and
13868 for the gallon

but maybe ACE cant sell it to the California stores, I know all our 2 cycle lawn and power equipment we sell has a seperate SKU for the Cali only models.

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Click on C.M. logo to go to my webpage


RIP R.J.B.

muratic acid Is what's used in swimming pools. You can it at a pool store. I've never even heard of the other before.

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OK, I'm over it. Where's the beer?