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Thread: Where to source loose abrasive powder for WEETing a mold?

  1. #1
    Boolit Man
    Join Date
    Sep 2017

    Where to source loose abrasive powder for WEETing a mold?

    I have a Lee mold that needs to be dropping a little larger than it currently is. After much reading around here, I think this thread is what I'm going to try:

    Is there somewhere local I should be able to pick up a small quantity of abrasive powder, in the 180-220 grit range? I figure that will expand and then I can just use toothpaste to polish the cavities back up.

    Everywhere I look I can only find paper- or cloth-backed abrasives. AKA sandpaper. We have Lowes, Home Depot, and Ace here.
    Currently in the process of developing the "perfect" cast .223 load for my AR-15. Click here to follow my progress

  2. #2

    Minerat's Avatar
    Join Date
    Jun 2008
    Jefferson County, CO
    Have you tried looking for valve grinding compound? Autozone should have it.

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  3. #3
    Boolit Master
    JSnover's Avatar
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    Dec 2007
    Bensalem, PA
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  4. #4
    Super Moderator

    Preacher Jim's Avatar
    Join Date
    Apr 2014
    That McMaster is what I have used. I have used valve grinding compound also.

  5. #5
    Boolit Master
    Traffer's Avatar
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    Feb 2016
    Central Wisconisn
    AKA hans.pcguy

  6. #6
    Boolit Master

    Join Date
    Mar 2013
    Northwest Ohio
    Mc Master Carr, MSC, Graingers all have it both wet and dry look under lapping compounds. Also if there is a tool supply house near you that specializes in machining tools they should have it. There is aluminum oxide and silicon carbide available along with some diamond grades. aluminum oxide is harder and dosnt break down as fast so it dulls more. Silicon carbide is softer breaks down better and stays sharp better. also as it breaks down it naturally becomes finer grit. Diamond is very hard ( usually used for polishing carbides and other very hard materials) and very fine it takes along time to remove metal with it but a mirror can be made.

    When lapping charge the lapp. every few turns add a drop or 2 of water or oil depending on your compound and a few more turns. The nice thing with dry compound is it can be used with either as you want.

    If you have a machine shop local they may be willing to sell you a small amount of what they have on hand. Take a pill bottle with you. A pint can of compound goes a long long ways. LOL. (I have a tube of yellow diamond here that's been in my box for 20 years. also red, purple and white.) It dosnt take much to lapp a mould. maybe a amount the size of a pencil eraser.

  7. #7
    Boolit Master

    jcren's Avatar
    Join Date
    Nov 2014
    South, Central Ok
    If you just end a bit, "barkeepers friend" is a mild abrasive powder in the kitchen cleaning section that is more agressive than polish or tooth paste but milder than grinding compound.
    "In God we trust, in all others, check the manual!"

  8. #8

  9. #9
    Boolit Master GhostHawk's Avatar
    Join Date
    Mar 2014
    Fargo ND
    I had a opened can of valve grinding compound I acquired somewhere I used for my first.

    Cleaned up and polished with this.

    I used a bullet cast through a 5/16's nut, poured the lead through the center hole.

    I "should" have done some hand filing in the gas check area. And I "should" have cut the nose off.

    I did not put any compound or polish in either area but it does migrate into them.

    I hand turned mine with a nut driver. Did not take long. Check often.

    I use the blue metal polish for many little odd jobs, nice stuff. I also put it on a plastic barber strop.
    Does a great job of polishing knife blades, even stainless. In 2 years I may have used half of that little tub. A little on a cotton rag is great for polishing up high carbon knife blades.

    Plan ahead, Go slow, check often.

  10. #10
    Boolit Master

    gwpercle's Avatar
    Join Date
    Sep 2011
    Baton Rouge, Louisiana
    Another mild abrasive is automotive Rubbing Compound which is slightly more abrasive than Polishing Compound which is great for a final lapping .
    I found things like Comet and tooth paste either too course or the grit was not consistent , rubbing and polishing compounds are ideal for finishing up .
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  11. #11
    Boolit Master

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    Apr 2009
    Southernmost State of the Union
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  12. #12
    Boolit Master MaLar's Avatar
    Join Date
    Oct 2013
    S,E, Idaho
    Try your local headstone maker they use abrasives of different gritts. I asked the one here and they gave me a large paper cup full just for asking.
    Do not confuse my being polite for weakness.
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