So I've been working on fixing up my grandpa's old bench grinder. We'll talk
more about this in a future video, but just know that this thing is covered in
rust. Normally, a little rust is fine, but this was so rusty that it actually
destroyed the on/off switch, so that rust had to go. In a previous video, I
discovered that vinegar actually works really well for removing rust, but if you
leave it too long, it will also damage the tools as well. So I only left the
parts soaking in the vinegar for something like five days, and then I
pulled them out so I didn't have to worry about damaging them. There was still a
decent amount of rust left, so I tried wire brushing that off, but that didn't
work very well either. Meanwhile, a ton of people suggested using molasses in the
comments on that video, so I thought now would be a good time to give it a try.
So you're supposed to mix up one part molasses with nine parts water.
It would be very bad if this broke... And then you let everything soak for between one and two
weeks. Here we are, 23 days later — again I
overshot things a bit — but it's been so cold lately. Now we have a chance to
take a look at what's left. I can already tell you one thing that nobody warned me
about in the comments, is that it's moldy. I guess, big surprise, a big vat of sugar
and water is gonna be pretty attractive to some fungus out there. That's a big
knock against it right away. There is no mold or anything with the
vinegar versus rust. But in any case, it's time to crack this open and see how bad
it is. Ugh, that's gross. That also smells very bad. Ugh. Hopefully you can still
understand me, but this is gross. So we'll start by
pulling out the first things I can get and then brushing them off with this brass
bristle brush. It should only scrub off any residue or random crap. It
shouldn't be actually damaging the metal or taking away a steel or anything. And
for the record, the smell is still really strong through the mask.
It's like molasses mixed with horror. Gewlch! OK, it looks a lot better than it
did, but so far this is far from miracle stuff. And now the jar.
Oh! That cleaned up nice, -ish. Next I gotta rinse these off.
Some people warned that the rust would return pretty quickly. I don't know if
that's what we're looking at here or if that's like leftover molasses or
something. This one has it, too. Now to give everything one last good wipe.
Now I'll paint on coat of Prep & Etch. This stuff helps protect the metal from
future rust, and also should help paint stick to it later.
Now I'll dry these off. And I'll spray them with PB Blaster. I'm not gonna paint these because they're
gonna be subjected to regular adjustment and use so this should protect them from
rust instead. It's been about 15 minutes, so now I can give these a rinse to get
most of the Prep & Etch off. Then I'll let them dry.
Now to go chuck this molasses out in the yard.
OK. The process is complete so let's review.
I paid five bucks for a container to soak everything in. 10 bucks for molasses.
That's five 12 ounce jars from Walmart for two bucks apiece. However, you might
be able to get this stuff for cheaper from a place that sells food for cattle.
For example, Tractor Supply has a one gallon jug of molasses for ten bucks.
I already had the Prep & Etch but one gallon of that is about 15 bucks from
Home Depot. The process was dead simple and pretty forgiving. I didn't destroy my
parts even though I let them soak an extra week. That mold though. I did not
enjoy digging through a tub of moldy water — splashing it all over my clothes
and the table, and having to clean everything off afterward. That part was
unpleasant to say the least. The results were pretty good but molasses rust
removal wasn't some magical process here. Tarnish remained on a couple of pieces
and that heavily rusted base even had some rust flaking off of it again afterwards.
Also remember that that base had been soaking in vinegar and
wire-brushed previously so it already had a headstart. <sarcasm>It could be that that part
had been forged in a salt factory or something like that.</sarcasm>
Or maybe the nine to one solution of water to molasses was too weak.
It's something to think about. Also some people say that molasses won't
remove paint. It definitely did here. Again something to think about.
Would I try molasses rust removal again? Before I answer, I just want to
acknowledge that humans benefit from mold and fermentation all the time.
Cheese, beer, wine, sauerkraut, penicillin... Even vinegar is produced by a vinegar mother,
which is basically a big blob of bacteria. That aside, I don't have to dig
through mold to enjoy those things — for the most part. That's what sets this
process apart and makes me not want to try it again. I just don't think the
grossness is worth it for run-of-the-mill projects considering that there was
still rust to clean off anyway. However, if I had to derust something huge like a
car door or a trunk lid, I could see molasses rust removal being worth
considering, mainly because it's relatively cheap to mix up a big batch
of the stuff. But if I did try it again, I would figure out a way to get rid of that mold before diving in.
I hope you like this video! If you want to see more then
consider subscribing. If you have any thoughts or questions feel free to leave
them in the comments below on YouTube. I try to respond to everybody who stops by,
and I really appreciate you taking the time to leave a note. Thanks for watching!
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