molasses rust remover

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molasses rust remover

Postby Landreo » Wed Nov 28, 2012 9:44 am

My co-worker was telling me how good molasses worked for him as a rust remover. I know it is a chelating agent for iron but was doubtful as to how well it would really work. I went to the deer bait department at TSC and got a gallon for $8, mixed 1 part to 4 parts water and placed some test rust in the mix. I used a piece of sheet metal with surface rust, new hot rolled with mill scale, and a motor terminal box with deep rust pits. Sat for a week since I never made it back to the molasses. After a week, the rust on the sheet metal and deeper rust on the cast terminal block was gone. Most of the mill scale was gone but not all.

I had a rusted inside briggs engine 1 gallon tank, washed with muriatic acid, washed with water until no flakes came out. Still with lots of solid rust so I plugged the outlet and filled with new molasses mix. Sat for two days and came out rust free.

The cost is $8 to make 5 gallons as compared to Evapo Rust which is $20 a gallon. May be an alternative for liquid rust removal.

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Re: molasses rust remover

Postby Stanton » Wed Nov 28, 2012 9:48 am

Good to know...and all nat-ur-al to boot! :D Thanks.
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Re: molasses rust remover

Postby SundaySailor » Wed Nov 28, 2012 10:15 am

I've heard about using molasses to remove rust before too. It does make a sticky mess, but it also does the job.
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Re: molasses rust remover

Postby pickerandsinger » Wed Nov 28, 2012 11:20 am

There's a post on you tube about using it .....Car restoration....I believe they used a 10 parts water/ 1 part molasses .....Said it works but takes time
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Re: molasses rust remover

Postby Rudi » Wed Nov 28, 2012 12:35 pm

We've known about the molasses mix for a number of years - about the same time that we were experimenting with TSP and doing all the discussions/tests/testimonials etc., over various ways to remove rust. Personally I believe molasses, even black strap belongs in the kitchen waiting to go on my plate ... :lol: , but that is just me. A lot of the antique car and motorcycle guys swear by it and there are probably as many who like molasses as those who like Washing Soda or TSP. Just a different method.
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Re: molasses rust remover

Postby Hengy » Wed Nov 28, 2012 2:27 pm

Looks like it completely gets rid of the rust, but sure takes a long time to wait for it to come out. I can wire brush and sand quite a few hoods, fenders and trim parts in three weeks!!

I do like the electrolysis treatment, though...
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Re: molasses rust remover

Postby thiggy » Wed Nov 28, 2012 11:37 pm

Is the molasses used in conjunction with the electrolysis, or just by itself?
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Re: molasses rust remover

Postby Barnyard » Wed Nov 28, 2012 11:51 pm

thiggy wrote:Is the molasses used in conjunction with the electrolysis, or just by itself?

By itself.
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Re: molasses rust remover

Postby Gary Dotson » Thu Nov 29, 2012 8:00 am

I've been wanting to try the molasses method for some time, but haven't gotten around to picking up a jug, yet. My wife collects kerosene lanterns and learned of this method from other collectors several years ago. It's the recommended method for gently but thoroughly de-rusting those old lanterns.

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Re: molasses rust remover

Postby TJG » Thu Nov 29, 2012 9:46 am

Is it hard to wash off the molasses? And does the molasses protect from new rust, or does the item just rust again after you rinse off the molasses?

Has anyone used Coke soda pop for rust removal? I know it will eat away nearly anything.

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Re: molasses rust remover

Postby Barnyard » Thu Nov 29, 2012 10:08 am

Todd, the molasses will wash off, but you have to primer the part or it will flash rust.
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Re: molasses rust remover

Postby Rudi » Thu Nov 29, 2012 10:12 am

Gary Dotson wrote:I've been wanting to try the molasses method for some time, but haven't gotten around to picking up a jug, yet. My wife collects kerosene lanterns and learned of this method from other collectors several years ago. It's the recommended method for gently but thoroughly de-rusting those old lanterns.


I think for Gary's uses the molasses might be a good choice - there are next to no negatives about it and it is mild which is good for delicate items.
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Re: molasses rust remover

Postby oronc » Thu Nov 29, 2012 11:38 am

Haven't tried this,Way to sticky for me. I been testing 3 different things on bolts,nuts,ETC. REAL!!! Lemon juice, white vinegar and coca-cola. I liked the lemon juice the best, Cola left a little sticky resisdue to clean up, And vinegar just stinks!!! Did work though, Lemon juice rinse off dry & primer.

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Re: molasses rust remover

Postby Landreo » Fri Nov 30, 2012 12:11 pm

I prefer mechanical methods of rust removal, sand blasting or wire brush but for some things liquid rust remover such as evapo rust seems ideal except...the cost. I have not seen a post on this board as to folk's experiences so I thought i would post mine. I don't think I will use it ofter but I have a few more gas tanks that need cleaned and the molasses is inexpensive.

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Re: molasses rust remover

Postby Gary Dotson » Sat Dec 01, 2012 9:00 am

As to concerns about molasses being a sticky mess, I would think that after diluting it with water, it should rinse off fairly easy. I guess I need to find out.


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