68 Cowl area restoration/rust prevention - Impala Tech
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post #1 of 7 (permalink) Old 06-29-2016, 08:31 PM Thread Starter
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68 Cowl area restoration/rust prevention

Needing ideas on what you guys have been doing to clean and restore the inner side cowl area down to the kick panel vents. I have the front clip off and repainting the firewall presently. I have all the plastic covers and rubber plugs out of the cowl section now. Oil fogging, factory spatter paint etc.. ? Thanks all!
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post #2 of 7 (permalink) Old 06-30-2016, 10:21 AM
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I used 3M's undercoating in the white can. It's about $15 here at NAPA. I've used this product on 2 restorations and have been very pleased with the results and protection.

And I use this for rust conversion once all the loose scaly rust has been removed, But I get it in a spray can.
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post #3 of 7 (permalink) Old 07-05-2016, 02:36 PM
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How many bottles/cans do you typically use on a car?

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post #4 of 7 (permalink) Old 07-06-2016, 12:49 PM
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Like Chris said, I do basically the same thing with similar products/goals.

1. You need to sand/scuff/wire-brush the surface rust.
2. Apply some type of rust converter, there are many types, I haven't found one particularly better than the other but RustOleum or similar aerosol is easy to use like Chris's picture above. (compared with something like Evapo-Rust, also good, but better for soaking parts.)
3. Apply rust prevention. Could be undercoating, could be paint, epoxy-primer or epoxy-paint, or Eastwoods "Rust Encapsulator", POR-15, I think Yellow Bullet has something as well. Lots of choices there. I like Epoxy Primer covered with Rust Encapsulator or paint.

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post #5 of 7 (permalink) Old 07-08-2016, 10:30 AM
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Originally Posted by So_In_Boiler View Post
How many bottles/cans do you typically use on a car?
On the S-I-L's Caprice is used 5-6 cans of Rust treatment and used 2 cans of Undercoating. Now, I didn't have to do the whole bottom side of the car.
I only touched up areas where I welded the holes shut and in the trans tunnel. My Nova took 6-8 cans of undercoating.

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post #6 of 7 (permalink) Old 07-11-2016, 08:39 AM
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If you are referring to the inside of the cowl assembly that is inaccessible, I cut out a section of the firewall on my Chevelle to get better access. I use Eastwood aerosol converter and SOAK the panels to penetrate the surface rust that can't be removed.
I thought I had a pic, but don't. The area I cut out is on the left side, forward facing cowl panel with the bead rolled X. Once the clip is back on, no one can see the weld seam.

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post #7 of 7 (permalink) Old 07-11-2016, 09:32 AM
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CRC sells a cold Zinc galvanizing paint that can be sprayed directly atop any rusty metal and it will stop any further rust from forming (at least so long as there is Zinc left to sacrifice itself. You can use a straw such as found on a WD-40 can to the CRC to spray an area accessed with only an eight inch diameter hole. The Zinc becomes an anode to offer protection.

If you don't mind draining the battery you can just put a charge on the car body the way bridges and out board motors are protected from salt water to prevent any rust from further forming. You can buy a corrosion inhibitor at many marinas or on line.

*Proytec SL | Cathodic protection for boats

It will only offer Cathodic protection when electrically connected other wise it relies upon the passive protection of the anode. But as I said the CRC product I have used on iron gates and fence parts offered decades worth of protection before it disappeared (literally: as you can see through the paint coverage when the zinc is gone). You can not paint over this product as it has a rough finish (looks like a galvanized pipe), or weld on it once painted as Zinc and welding creates toxic fumes.

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