Author Topic: How important is it to 'prep' a new mould?  (Read 259 times)

Steelhead

  • Global Moderator
  • Sr. Member
  • *****
  • Posts: 406
    • Born Wild Shooting Chairs
How important is it to 'prep' a new mould?
« on: March 01, 2019, 07:14:45 AM »
I have a confession...when I received my first three moulds (Arsenal, Lee, Lee) I didn't do anything but heat them up and start casting. Since then I've seen a few posts about prepping/cleaning moulds. I have received my nice new NOE mould and I want to make sure I don't damage it. Is there anything I should know? Feel a little stupid, but maybe this will help someone else from making a mistake (if I've even made one)


  • Petaluma, CA
Airforce Texan .308
Benjamin Armada .25 (sold)
Benjamin Discovery .22
Benjamin Prowler .177
FX Streamline .25
JSA Raptor .22

Born Wild Shooting Chair
Air Venturi compressor

Bullfrog

  • Administrator
  • Full Member
  • *****
  • Posts: 193
Re: How important is it to 'prep' a new mould?
« Reply #1 on: March 01, 2019, 07:16:36 AM »
I’m an amateur, so take my 2 cents for what its worth.

I do nothing to my molds except put a little spru lube on the pins and let it burn off as I cast.

sixshootertexan

  • Hero Member
  • *****
  • Posts: 553
  • Ricky B
Re: How important is it to 'prep' a new mould?
« Reply #2 on: March 01, 2019, 07:36:11 AM »
I spray mine with brake cleaner. Then rubbing alcohol and a Q-tip. After it is heated I apply synthetic 2 cycle oil  to the sprue plate with a Q-tip. I'm still new at this too.

And don't forget to heat cycle it like NOE says.
« Last Edit: March 01, 2019, 07:42:47 AM by sixshootertexan »
CCS 2300, CCS 2400, Custom Built Regulated .25, Custom Built PRod Clone, .308 Bullet shooter, XS46U .177, Custom regulated .177, 850 Hammerli .177

rsterne

  • Member 2000+fps Club
  • Global Moderator
  • Hero Member
  • *****
  • Posts: 1815
  • Mozey-On-Inn and see what Coalmont has to offer!
    • Mozey-On-Inn
Re: How important is it to 'prep' a new mould?
« Reply #3 on: March 01, 2019, 08:30:49 AM »
I haven't done anything except clean them with alcohol and blow them off with compressed air to make sure there are no machining fluids left.... Then I adjust the sprue plate so it barely falls open under it's own weight when "flicked" and the stop/latch pin so you can JUST feel the plate slide under it.... I put a couple of drops of sprue lube on the plate (at the pivot and between the holes), open and close it a few times to smear the lube around, and then use my fingertip to spread it over the plate and the top of the mould…. just the thinnest film possible....

Then I preheat the mould on a hotplate while I am melting the lead, and start casting.... I used to smoke the cavities, but the last couple of times I didn't bother, and did not have any problems with the bullets sticking....

Bob
  • Coalmont, BC

Steelhead

  • Global Moderator
  • Sr. Member
  • *****
  • Posts: 406
    • Born Wild Shooting Chairs
Re: How important is it to 'prep' a new mould?
« Reply #4 on: March 01, 2019, 05:39:38 PM »
Thank you all. I feel better now. The only thing I do is take a plumbers torch briefly to the mould to put a little heat in it to start.
  • Petaluma, CA
Airforce Texan .308
Benjamin Armada .25 (sold)
Benjamin Discovery .22
Benjamin Prowler .177
FX Streamline .25
JSA Raptor .22

Born Wild Shooting Chair
Air Venturi compressor