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sanding walnut

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Forum topic by Karda posted 05-21-2018 09:54 PM 839 views 0 times favorited 17 replies Add to Favorites Watch
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Karda

1173 posts in 637 days


05-21-2018 09:54 PM

Hi, the walnut bowl i am working on is developing yellow areas reminds me of cigarette stains on a light colored wall, does walnut yellow when over sanded that is the only thing I can think of


17 replies so far

View Loren's profile

Loren

10477 posts in 3731 days


#1 posted 05-21-2018 10:34 PM

Some kind of glazing? Can you scrape it off
with a razor blade?

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Karda

1173 posts in 637 days


#2 posted 05-21-2018 10:38 PM

I tried sanding it but that didn’t seem to work, I’ll try scrapping when I get back to it, got to rest my foot hell spur

View Jack Lewis's profile

Jack Lewis

309 posts in 1161 days


#3 posted 05-22-2018 02:51 AM

Have you tried a couple of sealer coats and then sand? It will fill the pores and stop the sanding dust from filling.

-- "PLUMBER'S BUTT! Get over it, everybody has one"

View LeeMills's profile

LeeMills

568 posts in 1384 days


#4 posted 05-22-2018 03:15 AM

What Jack said. I do not know what you are sanding with or if the “yellow” areas are just in the white. If just in the white try hand sanding just the white area or lock your spindle (so the bowl won’t turn) and sand with 2” disc or palm sander.
If the newly sanded area is not yellow then you are probably dragging dark dust to the white from the dark side.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

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Karda

1173 posts in 637 days


#5 posted 05-22-2018 03:39 AM

Hi the yellow scraped out. The heavy sanding is to try to get out some torn grain i just cant turn out When I scrapped I got most of it but there is still some. I’ll apply some shellac before i sand. The yellow is in the white sapwood.t finished a walnut bowl that is mostly sapwood and there is know yellow what so ever. thanks Mike

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Karda

1173 posts in 637 days


#6 posted 05-22-2018 10:05 PM

HI, I finished the inside of the walnut bowl and as so as I started sanding it started to yellow, I changed to a different brand paper and it still yellows, I have never had this happen before. I did one from the same log and it is mostly sap wood and that turned lout fine, here pics. the yellow is worse than appears on the pic

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LeeMills

568 posts in 1384 days


#7 posted 05-22-2018 11:47 PM

Well you got me on that one. Don’t think I have seen that before. If it had been on both bowl I may have guessed spalt (yes there is yellow spalt) but it should have shown up on the other bowl also.
Hope you find out what is causing it.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

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Karda

1173 posts in 637 days


#8 posted 05-23-2018 04:34 AM

I am going to sand it out and how it turns out is how it turns out

View LeeMills's profile

LeeMills

568 posts in 1384 days


#9 posted 05-23-2018 12:56 PM

The only thing I can suggest is maybe using wood bleach (in the paint section of the store) on the white areas.
If you are unhappy now it probably can only make it better.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View soob's profile

soob

269 posts in 1292 days


#10 posted 05-23-2018 05:10 PM

Is it dry? It might be fungus. I mean, it’s around a patch of sapstain fungus [the dark spots near the rim in the second picture].

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Karda

1173 posts in 637 days


#11 posted 05-23-2018 05:28 PM

No it has been cut a month or less, 3 weeks maybe. Still green

View Woodknack's profile

Woodknack

12230 posts in 2463 days


#12 posted 05-23-2018 05:47 PM

Burning by Sanding too fast?

-- Rick M, http://thewoodknack.blogspot.com/

View soob's profile

soob

269 posts in 1292 days


#13 posted 05-23-2018 06:27 PM

There’s a fungus among us, then, probably.

If you want to fight sapstain and fungus there are different chemicals that can work (but bleach isn’t one of them!).

Google the exact chemical names but there are two really popular ones that are also commercially available. One you can get as a paint additive (called mold preventer or the like), and the other is an ingredient in algaecides.

I looked them up, they’re iodopropynyl butylcarbamate and didecyl dimethyl ammonium chloride. Say that three times fast!

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Karda

1173 posts in 637 days


#14 posted 05-24-2018 03:13 AM

ok thanks I think this is trash anyway. I have some tear out that I cannot smooth. its not a good bowl I drilled the wrong side for a live edge bowl so I had to dowel the hole. thanks Mike

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Karda

1173 posts in 637 days


#15 posted 06-14-2018 03:37 PM

Hi, I have an older piece of walnut, about 4 months old. Before I even put it on the lathe. I want to decide how I want to treat it after I turn it. Should I seal first then sand. or take my chances. If I get the yellow I do. Will white shellac work as a sanding sealer. Thanks Mike

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