tcrocker
off to a rocking start
Member since October 2023
Posts: 2
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Post by tcrocker on Oct 13, 2023 4:04:59 GMT -5
I have some petoskey stones that my daughter sprayed with clear coat (or possibly clear nail polish) I would like to know if I can put them in a tumbler with the coating or if I would need to try to remove it first. It would be easier to put them in the tumbler as is. Thank you for any info.
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brybry
Cave Dweller 
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Member since October 2021
Posts: 1,221
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Post by brybry on Oct 13, 2023 4:47:56 GMT -5
Should be able to tumble as is. Grit will wear down stone soba clear coat will be easy to wear off.
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Post by jasoninsd on Oct 13, 2023 6:23:54 GMT -5
Welcome to the forum!  I'd agree with Bry. I'd put them in as is... |
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Post by vegasjames on Oct 13, 2023 7:33:23 GMT -5
Clear coat is very soft, so it would come off easily but the small flakes could make quite a mess. You can soak the stones in a solvent like acetone first. Or tumble them shortly with just some water and sharp rough stones, then wash and tumble as usual.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,633 
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Post by RWA3006 on Oct 13, 2023 9:46:31 GMT -5
Clear coat is very soft, so it would come off easily but the small flakes could make quite a mess. You can soak the stones in a solvent like acetone first. Or tumble them shortly with just some water and sharp rough stones, then wash and tumble as usual. This is correct. Various clear coats will tend to embed the grit inside which reduces the desired action. I'd soak them in acetone for a while, then let them dry and follow by tumbling with sharp gravel. After that I'd tumble with grit as usual. |
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Post by parfive on Oct 13, 2023 14:16:53 GMT -5
Petoskeys are not hard rocks. Don’t start with coarse grit in the tumbler, try 500 first.
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Post by chris1956 on Oct 13, 2023 15:54:40 GMT -5
My eyes are getting bad as I missed the "Petoskey" part of your post the first time around. You might look through the Michigan Rocks Youtube posts (I think I can post the link below). There is one where Rob details how to tumble Petoskey Stones. However he uses dry (I think conrncob) media.
I have only recently tried to tumble a few small Petoskey Stones using wet. I wouldn't use anything coarser than 500. Even at that the eyes tend to undercut a lot. So dry may be the only reasonable way to go but the ultimate finish is nowhere near what you will get with other harder rocks. Good luck and let us know how it turns out.
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Post by jasoninsd on Oct 13, 2023 21:01:17 GMT -5
Clear coat is very soft, so it would come off easily but the small flakes could make quite a mess. You can soak the stones in a solvent like acetone first. Or tumble them shortly with just some water and sharp rough stones, then wash and tumble as usual. This is correct. Various clear coats will tend to embed the grit inside which reduces the desired action. I'd soak them in acetone for a while, then let them dry and follow by tumbling with sharp gravel. After that I'd tumble with grit as usual. Well heck! I just learned me something new today! Thanks Randy!! |
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tcrocker
off to a rocking start
Member since October 2023
Posts: 2
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Post by tcrocker on Oct 22, 2023 18:07:15 GMT -5
This is correct. Various clear coats will tend to embed the grit inside which reduces the desired action. I'd soak them in acetone for a while, then let them dry and follow by tumbling with sharp gravel. After that I'd tumble with grit as usual. Well heck! I just learned me something new today! Thanks Randy!! |
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