oil based rust proofing?
 

Does anyone rust proof their summer only 80s 911?

Does rust proofing a galvanized 911 make any sense?

Any reasons why I shouldn't?

I would recommend it, given your location. Is it stored in a heated or unheated garage?

The problem with "rust proofing" -- I assume you're talking about adding the tar-like undercoating -- occurs when the coating starts to fail. Moisture can get under the material and remain longer than if there was no undercoating, causing more damage.

Getting a good coat -- in an attempt to prevent failures -- can be especially difficult if you're applying the material to a 20-year-old car -- you might end up sealing in salts and dirt which will help cause the material to fail and work with the moisture bound to enter the failure to attack the paint/galavinized coating and finally the steel.

Personally, I'd leave an older car as it is and clean the underside regularly, dealing with individual chips/scrapes with touch-up paint, and avoid any undercoatings.

I'm not far from you in Erie, PA. I've never done it to my p-car but I have to my old '73 Ford F-100 pickup truck that I use and abuse even in winter. I've been using used motor oil sprayed up under the underside; it’s worked for me for past 25 years. I've been told that the used stuff is not good to use because of acids and corrosives left over from combustion...but you could use new motor oil- still cheap- you only need about a gallon. What I found was nice is that it softens up the old under coating and makes it nice and pliable again. It creeps into all small crevices and I believe really slows the whole rust thing down. The worst part of it is that for a few days after application it drips on your driveway and also when you work on the vehicle it can get a little messy!

Crown rust control. Park on the street for the next two days.

Over here a product called Waxoyl is widely available and comes with pretty good results from many classic car clubs.
Its injected into chassis/sills at high pressure.
Dries to give a clear wax look finish.
Gave my car its first coat a few weeks ago - concentrating where the repairs had been carried out but eventally spraying all panel internals. Pretty pleased with the results.
Also don't let the fact their galvanised make you think they don't rust!!!!!!!

DIY rust control
 

First off, I'm cheap. Second, I've had every kind of rust bucket winter beater imaginable. I'm a self procalimed expert on rusty old cars....


Having said that, Waxoyl is great stuff, and dries to a flexible wax coating. Huge following among the land rover crowd, who are constantly fighting rust and first introduced me to it.

It is not commonly available here in the states, so when you do find it the price is high. There is a semi-readibly available alternative, that is fish oil based, that works wonders for cheap but begins to stink any time the outside temp goes above 90. Dont ask me how I know.

Being cheap, a DIY waxoyl substitute that seems to work just fine can be made from the following:

1 gallon mineral spirits
1/4 - 1/2 lb of cheap candles (parrafin works best, but is kinda spendy)
1/2 quart ATF

Oddly enough, mineral spirits will dissolve candle wax pretty easily. Grate the candles up with an old cheese grater, and put the shavings in the mineral spirits. Add the ATF and let things sit until the wax is in solution. If you want to speed things up, you can place the mix in a tub of hot water. Shake occasionally, and withing a week everything is set.

Load it into a cheap garden sprayer, and got to town on the underside of your car. (clean of course) Once the mineral spirits evaporate your left with a nice semi flexible undercoating for cheap. Make sure to get the solution everywhere, in all the crevices you can.

As an aside, try to use non-colored candels. Somewhere out there is an old F-150 with a pink coating of wax all along the underside.

Vin

I used waxoyl on my 73, very happy with it. my application advice is put in on in a thin coat, wait a week, then do another coat. If you put on a thick coat and its hot out, or near the engine, most of it will run off before setting up.

here's the only place in the states I found it. they were back ordered which seems to be common, but they have it in stock now, or did last week when i ordered more.

http://www.propermg.com/waxoyl.htm

I guess the mg crowd likes it too since this is an mg site.

jason

"I've been using used motor oil sprayed up under the underside"

- Used motor oil is toxic waste. I don't know if you are doing this or if a commercial establishment is doing it. Either way, fines are serious - and would put most retail places out of business. The federal toxic waste laws also contain criminal provisions with jail time -- this was added after dozens of children either died or had deformities and handicaps. That is unlikley esp. for a car owner, but still possible.

The other problem is that some of this stuff is coming off on your garage floor or carport and being tracked into your house. It's a threat to any kids or animals you have - esp. if you have carpets, which retain contaminants. Also bad for adults tho they almost certainly won't die or become deformed from it.

Sound like a bad idea yet?

Some undercoating tips:

Waxoyl has a good rep. The installer is critical. Be sure they don't block your drain holes or get it on your windows. How paranoid are you? Willing to pull off every interior panel? The car will be a lot heavier, too. But, you can redo the stereo and include some noise blocking sprays too.

Cars after about '77 or so have all they need and just need a touchup periodically. I inspect the bottom carefully every year and use 3M spray. I don't live in a rust area but did as a college student. I became paranoid after my best buddy spent all his savings on a 2000 BMW. When we jacked it up and put it on stands, it collapsed and fell right thru all 4 of them! Luckily, he hadn't crawled under yet....

The injection kit supplied by Waxoyl is not up to much - you just cannot get the coverage or pressure required. I bought one of these injection guns - very cheap (approx £10) - its superb when hooked up to the compressor. The feed tube is ideal for internal coverage.

http://forums.pelicanparts.com/uploa...1098387669.jpg

I use new motor oil. There are several oilers in our county whom apply and haven't been shut down for the last 20+ years. I didn't say it was perfect, I just said it worked with fairly good results...i.e. 31 year old Ford truck is an example and I'm in the rust belt!

New motor oil is no problem, Biff (except for being messier than things that harden or at least don't drip). It is the toxic metals and combustion byproducts that render used oil toxic.

But doesn't your post above say "used"? Or did you mean left-over new oil?

I have an older airplane, and there are a bunch of oil based protectants that we fog into the wings for corrosion protection. Corrosion-X is the more popular brand but the best stuff, in my opinion, is called Boeshield T-9. It was developed by Boeing. You can buy it by the gallon or in spray cans. It is a light mineral spirit carrier and an oily/waxy self-sealing coating. You spray it on and it is low viscosity, running into all the cracks, etc. Then, the carrier evaporates leaving the oily-waxy coating behind. I'm planning on cleaning the underside of my 89 and carefully coating it with Boeshield before this winter, using spray cans.

As Phil said,,, this stuff is really great, the mineral spirits carrier really lets it get into the cracks, and whats nice is the company is just down the road from me. http://www.boeshield.com/index.htm
Craig

I've sprayed the engine compartment with used motor oil a few times, but never on purpose. :)

Since this is a summer only car, I wouldn't rust proof it. I hate rustproofing. I understand the need for cars used in salty/snowy environment, but other than that it just makes the car hard to work on.

I can't see how a business is allowed to apply new motor oil to a car for rustproofing purposes. While used oil is worse new motor oil is certainly toxic and bad for the environment and peoples' health.

http://www.nature.nps.gov/hazardssafety/toxic/oilnew.pdf

This talk of spraying the underside of a 911 with motor oil, new or used, on purpose! . . . just the thought of that alone is killin' me!

I need to sit down - I feel a little weak.

http://forums.pelicanparts.com/uploa...1098726110.jpg

http://forums.pelicanparts.com/uploa...1098726153.jpg

Oh what an underside
 

That underside is simply amazing - can I see a picture of the entire car?