Possible substitution for pumice [?]

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M.S.A.

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Possible substitution for pumice [?]

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M.S.A.

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M.S.A.

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M.S.A.

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M.S.A.

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M.S.A.

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M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 15:27:23

Doitsujin

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

Interesting. But algae on the guitar?... How solid are they? I could imagine that they rott(stink), change color or do something unwanted?

Do you want a guitar smelling like seafood?

Well, I have no experience with these features,... Just try it. ^^

REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 15:37:18

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 15:56:50

Anders Eliasson

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

I think the pictures are wonderfull, but I´m not going to change. Pumice is small or fine enough if you buy a good quality made for Luthier use.

What colour does this algae thing have when sucking up French Polish.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 16:17:46

M.S.A.

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M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 17:24:58

Gummy

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

I remember in school learning that they were used in toothpaste as an abrasive.

REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 18:03:46

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 18:30:19

estebanana

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

Beautiful, violin makers use it. One of the traditional schedules of abrasive to rub out violin varnish is pumice, diatomaceous earth and then rotten stone. I've used it and it's nice to see the pictures.

Pumice is a better pore filler because it's essentially ground volcanic glass, but the DE is an order of grit less rough and it does have it's uses.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 18:54:02

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 19:36:37

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 20:01:36

prd1

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

When using pumice at the very first stages of polishing - are we trying to fill the pores with pumice or are we using the pumice to form a grinding paste to cut the wood grain so that the wood itself forms the filling medium?

I was suprised to hear from an earlier post that when removing the polish a white pumice filling was visible? Is this normal?

Having said that... I used have previously rotten stone as a first cutting agent and had a pretty bad result as a dirty finish could be seen.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 22:13:31

estebanana

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

Oh boy rotten stone is for later and it used over a totally varnish sealed surface with oil as a vehicle. It will mess up raw wood by clogging it and discoloring it.

Rotten stone is cool and it's fun to know about historical stuff, but Micromesh and especially Buflex sheets have replaced it for final guitar finishing. Still it's much cheaper than the modern fine abrasives. Back in the pre industrial times sharkskin was used as a kind of fine sandpaper and then pumice, DE and rotten stone were used.

The other use for DE is in painting, old masters and modern painters alike have used it o build up body in oil paints. If you look close at paintings by Braque you can see he sometimes mixed sands and other fine dusts like DE in the paint.

Funny what things bring back memories. My first teacher showed me how to polish finishes with this stuff when I was a teenager. he was a violin restorer and bowmaker and I was taught to varnish the cellos and then rub them out with these abrasives. Things were so simple then, all I had to do was sit there and be taught. I wish I could hang out with that guy again, but he's gone.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 22:57:11

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 23:09:57

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 23:16:50

M.S.A.

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REPORT THIS POST AS INAPPROPRIATE | Date Mar. 1 2011 23:34:05

Sean

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RE: Possible substitution for pumice [?] (in reply to M.S.A.)

Cool pictures, the fourth one looks like an alien spaceship.
I never got into the whole epoxy pore filling thing, to stinky, messy and not any easier to use then pumice just different. I have never had pumice look like chalk ground into the pores like your picture shows ever, perhaps they didn't care a whole lot because it was going to be buried underneath a coloured finish.

REPORT THIS POST AS INAPPROPRIATE | Date Mar. 2 2011 3:50:30