look what I dug up

[oldtoolsniper]

I don't think I would wire brush my molds either.

[Sasquatch-1]

OK, Maybe I didn't think the brass wire brush out very well, but I think the brass wire brush would do less damage to a steel mold then the SS media. As I said you can use a cloth on some sort of dowel to get out that last little bit. Also, there are nylon bristle brushes out there.

[Shakey Jakey]

Whatever you do, dont use the electrolysis method. This reminds me of having teenagers!

[ffries61]

Well I for one did rig an electrolysis setup, and a big thank you, to you guys for pointing me in that direction, I had a couple of improperly stored molds that needed a light rust removal, and it works great !!
Now I'm looking around the shop for some other things to de-rust

Fred

[Shakey Jakey]

SSSHHHH, dont tell.

[warf73]

Nevermind, I just googled it. Good ol sodium carbonate. Looks like it isnt sold here in nevada though. But that gives me an excuse to do a little kitchen chemistry and convert sodium bicarbonate into sodium carbonate.

I use soda ash, can buy it as any pool/hot tube dealer that sells pool chems. you can also use Arm & Hammer Washing Soda sold at Wal mart Kmart, Korger, IGA most any place that has a cleaning isle.

[TheGrimReaper]

I'll admit that mold does look really rough.

[zuke]

Hard to be sure from the pictures, but the edges of the mold cavity don't look sharp any more (2nd picture). It also didn't get all the rust.

He took them on trade for a really good deal. It wasn't till he got home he realized how bad a shape they were in. That was a couple year's ago, they've been in oil since then.
He told me about them and I thought I'd try it out. He had nothing to loose. I'm tumbling for 12 hour's then onto the wood pellet stove to dry off and heat up then into an oil bath.
I'm doing this as a favour, so time will tell.
I'm leaving a little bit for him to do, but the bulk of the work is done.
He has 5 mold's,and that's the worse one.

[imashooter2]

He took them on trade for a really good deal. It wasn't till he got home he realized how bad a shape they were in. That was a couple year's ago, they've been in oil since then.
He told me about them and I thought I'd try it out. He had nothing to loose. I'm tumbling for 12 hour's then onto the wood pellet stove to dry off and heat up then into an oil bath.
I'm doing this as a favour, so time will tell.
I'm leaving a little bit for him to do, but the bulk of the work is done.
He has 5 mold's,and that's the worse one.

Not meaning to offend, but you aren't making the molds better by rounding over the parting line. I highly recommend you make an electrolytic rig or use Evaporust to avoid further damage.