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Paint Shop Tech. Talk about paint removers, thinners, primers and application techniques plus related topics. Rust removal, paint substitutes and color matching.

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Rust Removal / Paint Preservation?


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Old 01-02-2018, 12:26:14 PM
oldmotorette oldmotorette is offline
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Default Rust Removal / Paint Preservation?

I'm in the middle of a winter project - restoring a '58 Sears Allstate motorcycle. The plan is to do a full mechanical restoration, while preserving what original paint is left and getting rid of the rust. I'm going for the now-popular "patina" look. I've been using Evapo-Rust with great success; it'll make the rust disappear without seemingly harming the paint at all. Great stuff. However, this method is very pricey, with Evapo-Rust running anywhere from $14-$25 a gallon. And it tends to run out of breath fairly quickly. So my question is: will vinegar work to suit my purposes just as well (but I know - a lot more slowly). I've used vinegar on rusty bolts and such, with success. Just wondering if it'll eat the rust but NOT the paint - at about 1/10th the price? Thanks.
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Old 01-05-2018, 08:15:21 PM
BernieTech BernieTech is offline
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Default Re: Rust Removal / Paint Preservation?

? electrolysis tank?? Not sure about effect on paint. It does work on RUST.

I just started playing with it before the cold. Anybody need a block of ICE. Seems to clean up CI skillets real nice.

I played with vinegar, then NaOH (be careful), Like the electrolysis better.

Bernie
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Old 01-12-2018, 12:53:59 AM
oldmotorette oldmotorette is offline
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Default Re: Rust Removal / Paint Preservation?

Well...what I ended up doing, after all: Evapo-Rust. Put a non-oily piece of rusted, painted something in it...and maybe as much as 24 hrs. later, all the rust is gone, whatever paint was still adhered, is still there. It seems to help(speed up) the process, if you're working with heavy rust, is to pull the piece every so often and give it a water rinse/wipe down to knock all the dead rust off the surface and expose fresh rust. Seems to brighten up the paint, also. Here are before/after pics of one tank side - the "after" got a final soak to freshen up the exposed metal a bit more. Hopefully, I did well on posting pics - not too savvy, here.
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Old 01-13-2018, 12:04:34 AM
s100 s100 is offline
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Default Re: Rust Removal / Paint Preservation?

Don't use electrolysis. It eats paint. Looking at your "after" pic, there's still quite a bit of rust visible on that tank (and mighty little paint). I've used muriatic acid on similar stuff and it has not damaged the paint while removing the rust (I suspect that muriatic acid is the engine in the Evapo Rust). But in my instance I did not care about the paint so of course it would not damage it. I'd suggest trying this on some parts you don't particularly care about as a test. Do it outside. Wear goggles. Wear gloves. Don't breathe any fumes. Wear crappy clothes in case you splash something on them. Keep a bucket of water handy to rinse yourself off if you get the stuff on you. Apply some of the acid to the metal with (what else) and acid brush. It's good to keep the surface moist but you can always apply more if it dries out. When you get bored or tired of doing this and want to call it a day or if the rust seems to be coming off (you can use and old toothbrush to scrub a bit) rinse the parts thoroughly in cold water and scrub a bit to loosen as much remaining rust as possible. Then DRY the part to keep it from rusting again. I did this with a few old machine tools which looked pretty dismal (but not rusted anywhere as badly as your tank) and to my surprise the pieces came out looking almost as good as new. A coat of clear finish as a sealer would be good but in my instance I just gave everything a good coat of paste wax. Years later they still look just fine.

You can get muriatic acid at any good hardware store and it is cheap. A quart goes a LONG way.
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