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Author Topic: surface rust on mould  (Read 880 times)

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Offline Doc Killpatient

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surface rust on mould
« on: February 23, 2005, 01:30:56 AM »
I have just been given, 3 lyman 4 cav. , and 1 lyman 2 cav moulds.  All with handles and are in pretty good shape.  I have always used aluminum moulds in the past and was wondering what is the best way to clean very minor surface rust off these moulds?  Is there anything not to do to them?  I just don't want to do any damage to em.  Thanks in advance.
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Offline Forest T

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rust on molds
« Reply #1 on: February 23, 2005, 04:16:35 AM »
Dockkillpatint whin I get a mold with rust on it I take some oooo steel wool and take it off with it then I take all of the following in equal parts mineral spirts karosean acetone and automatic transmission fluid I keep that in a gal. paint can I dip my molds in this whin not in use whin I need to use them I just spray them down with break cleaner hope this helps  8) Forest T
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Offline Leftoverdj

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surface rust on mould
« Reply #2 on: February 23, 2005, 05:26:54 AM »
Being lazy, I just drop each half in my case tumbler for a few hours. Do them separately so they don't bang into each other and have the screws in ao the screw holes don't clog.
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Offline Graybeard

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surface rust on mould
« Reply #3 on: February 23, 2005, 06:13:50 AM »
Remove sprue plate and handles. Put masking tape over top of mold. Spray with Rustoleum paint. Problem cured now and forever. The heat will actually bake the paint in place and make it nearly impossible to remove. Rust will stop and not form again under Rustoleum paint.
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Offline Doc Killpatient

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surface rust on mould
« Reply #4 on: February 23, 2005, 08:00:30 AM »
I like the idea about the paint.  However, I have one mould with a spot of rust on the inside of the mould itself.  It is not in the bullet cavity, it is on the block area on both plates.  Can I use a soft brass brush to remove it or will it damage the mould.  I have been soaking the area with penetrating oil and rubbing it with a soft cloth.  I may be making a mountain of a mole hill but I am not sure what to do about it.  Thanks
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Offline Flash

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surface rust on mould
« Reply #5 on: February 23, 2005, 11:55:13 AM »
I use my Dremmel tool with a flat wire brush that they(Dremmel)market and it takes all the rust off a mould perfectly, cavity and all.
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Offline Leftoverdj

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surface rust on mould
« Reply #6 on: February 23, 2005, 12:34:33 PM »
Doc, try a pencil eraser on that spot.
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Offline Doc Killpatient

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surface rust on mould
« Reply #7 on: February 24, 2005, 02:11:44 AM »
I now have several functional new moulds added to my arsenal.  Thanks to you guys:
.452 230 gr. RN 4 cav  Lyman
.356 147 gr. RNBB 4 cav  Lyman
.452 185 gr. SWC 4 cav Saeco
and a 44 cal. not sure of grain 2 cav. Lyman

All are casting great and the price was right.  FREEEEEEE

Thanks for all your input.

Doc
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Offline Louis Farrugia

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STEEL MOULDS
« Reply #8 on: May 05, 2005, 05:55:54 AM »
Quote from: Graybeard
Remove sprue plate and handles. Put masking tape over top of mold. Spray with Rustoleum paint. Problem cured now and forever. The heat will actually bake the paint in place and make it nearly impossible to remove. Rust will stop and not form again under Rustoleum paint.


HI GRAYBEARD
I USE A MAGMA CASTER  AND ALL MOULDS ARE CASTSTEEL I JUST LEAVE THEM SUBMERGED IN THINNER TILL I NEED THEM ,
THEN I JUST DRY, THEN AND USE .

LOUIS
MALTA EUROPE
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Offline utk

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surface rust on mould
« Reply #9 on: May 08, 2005, 09:54:23 PM »
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Offline Doctor Sam

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Rusty mold
« Reply #10 on: May 16, 2005, 04:43:43 AM »
I have used the method outlined in utk post to remove rust and it works great.  Battery charger and some common bicarb, along with a nail is all that is needed.
Rust free after an hour.
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Dr. Sam
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