De-Rusting the cavities of an H&G mould

[nicholst55]

Evaporust. Great stuff for light rust.

^^This^^.

[dkf]

If it was me I'd use the Evaporust to soften and remove as much of the rust as possible. Then cast some bullets, drip/tap the base of several for a screw and then lightly lapp each cavity (turn lapp with a drill) with some fine 400-600 lapping compound.(same amount of seconds for each cavity) The lapping will help smooth out any rust and pits. Iron molds take a lot of lapping with courser compound to change the size so you really do not have to worry about it with fine compound and a short amount of polish time.

[gregtu]

Anyone tried CLR, available pretty much anywhere. I haven't used it on a rusted mold yet, but it has worked well on other rusted metals for me.

[quasi]

I apply BullPlate to the rust, let it sit for 5 minutes and scrape off the rust (or lead) with a chop stick.

[gwpercle]

Another vote for Evapo - Rust Super Rust Remover.
Back in the dark ages long soaks in kerosene were used...Evapo - Rust works better.
Scrub with firm bristled toothbrush...avoid wire wheels like the plague.

[FISH4BUGS]

I took a long hard look at EvapoRust and Naval Jelly.
I went with naval Jelly and it seemed to work nicely.
There is still just some minor rust in the cavities that will come out with some elbow grease and some steel wool.
The mould looks awful but the cavities will probably come out just fine. The bad areas are on the drive bands which will be taken out at resizing anyway.
This just might work out!

[Sled]

I’ve started on my rusty moulds with Kroil but will likely need som navel jelly. The good thing is the cavities look pretty good as all the moulds I have were stored for 20 years, in Arizona. And loaded with lead.