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Tumbling With NuFinish Problem & Question

Discussion in 'Handloading and Reloading' started by mkl, May 14, 2008.

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  1. mkl

    mkl Member

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    I just got an new Lyman Tubro Tumbler Twin and have a question regarding using the NuFinish car wax.

    After reading the advice on this forum, I started out with a 50/50 mixture of walnut/corncob media. I then added about a cap full or maybe a little more of the NuFinish polish.

    After tumbling around 150 cases of 30-06 brass in the large bowl, they came out perfect. My problem [question?] is that the tumbling bowl ended up with a "skin" on the bottom. Nasty looking since it had the carbon from the cases mingled into it.

    I can scrape a little off with my finger nail, but there is still a bunch of "skin/plastic film/crud" left plastered on the bottom of the tumbling bowl. I can grab an edge a peel a quarter inch or so off, and then the "film/plastic wrap" coating breaks off and I have to scrape another edge up.

    Is this normal? I'm guessing that this is NuFinish leaving a build-up on the bottom of the bowl, but not sure.

    Comment appreciated.
     
  2. Bowfishrp

    Bowfishrp Member

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    I dont normally put nufish in my tumbler every time because it does tend to leave a residue that I dont like. But if I have something in there, I just dump in another load of brass and it wont be there much longer. :)
     
  3. Shoney

    Shoney Member

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    Nufinish is a silicone-based polish, probably with some synthetic compounds to coat and protect the car finish. So, yes, it is normal to form what you have in the bottom of your pan. The black stuff in there is probably high in lead, so be careful how you dispose of it.

    I cut up an old bounce dryer sheet into about 1 to 1 1/2 inch squares, and put it in with the media. I change the paper out with each new batch. You still get a film forming but it is not that prevalent.
     
  4. Idano

    Idano Member

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    I have never noticed a skin forming on the bowl from using Nu Finish and I have been using it for about two years. I replaced the cap on the Nu Finish with a dish soap bottle quirt top. Now when I remove a bunch of brass from the tumbler I replace the pieces of dryer sheet and squirt a ring of Nu Finish and let the tumbler run for about five minutes before I put it away. If I am doing a lot of brass I will just change the dryer sheet and not add any Nu Finish; I like it to be dry when I add my brass. I also use the 50/50 mix of walnut and corn cob in my polish tumbler. I have a second tumbler with walnut only for cleaning off the lube from resized cases and do not use Nu Finish in it. /I found that corn cob has a tendency to absorb the case lube and clump.
     
  5. ReloaderFred

    ReloaderFred Member

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    Once you've used up the media, and you're getting ready to replace it, put about two capfulls of mineral spirits in it, with the last batch of brass. After the brass is polished, the mineral spirits will have removed the deposits from the bottom and sides of your bowl and now be absorbed into the media.

    Hope this helps.

    Fred
     
  6. SSN Vet

    SSN Vet Member

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    That Fred....he knows everthing.
     
  7. kennedy

    kennedy Member

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    nu finish works great in moderation, 1/2 cap every 250 or so cases, with dryer sheets, never had any build up
     
  8. mkl

    mkl Member

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    Thanks Fred!

    That's the piece of information I needed. Just about to replace the media anyway, so on the last gasp of the stuff, I'll clean the brass and the bowl!
     
  9. stephpd

    stephpd Member

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    quote:

    Thanks Fred!

    That's the piece of information I needed. Just about to replace the media anyway, so on the last gasp of the stuff, I'll clean the brass and the bowl!



    +1

    That bit of information made my day complete. Best thing I've heard for tumblers.:D
     
  10. ReloaderFred

    ReloaderFred Member

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    You may want to put a piece of cardboard the same size as your tumbler lid between the bowl and the lid. I found that sometimes the condensation from the mineral spirits will loosen the glue on the foam on the lids of my two Thumler's UV-18's. By placing a piece of cardboard, it absorbs any moisture and keeps the glue from loosening, but if you have another brand of tumbler without the foam rubber in the lid, you may not need it.

    Also, if the buildup is quite heavy, it will take more mineral spirits to "melt" it. I've found that corn cob works best for cleaning the bowl, since corn cob absorbs, whereas walnut shell doesn't.

    Hope this helps.

    Fred
     
  11. DaveInFloweryBranchGA

    DaveInFloweryBranchGA Member

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    Also, don't use quite so much Nu Finish. I use a capful at the most at one time and that's more than plenty. Some things are best used in moderation to get the best affect. Kinda like a drink on a date with a pretty woman is good, but several drinks becoming plastered is probably a bad idea.
     
  12. DWARREN123

    DWARREN123 Member

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    Take the bowl off and clean it with dish washing detergent, see if this helps.
     
  13. WayneConrad

    WayneConrad Member

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    One caution about mineral spirits. My bowl, made of plastic, started to come apart after the mineral spirit treatment. The stuff may not be safe for all tumblers.
     
  14. Farnorthdan

    Farnorthdan Member

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    I do what fred does and use the mineral spirits.....it works great
     
  15. scrat

    scrat Member

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    mineral spirits do work very good. for the day to day maintenance. use dryer sheets and pieces of paper towels. That will help get out most of the dust as well as other contaminents
     
  16. jcwit

    jcwit Member

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    That skin will happen with new tumblers. Mine did the same at first, just keep using it. It will stop, and use the dryer sheets it will also save your media "keep it clean longer".
     
  17. RustyFN

    RustyFN Member

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    Yes the dryer sheets work great. Just make sure they are used or they will leave some crud in the bowl. I use paper towels and they work good also.
    Rusty
     
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