LumberJocks

walnut bowl finish rough

  • Advertise with us

« back to Woodturning forum

Forum topic by Karda posted 05-16-2018 11:14 PM 288 views 0 times favorited 7 replies Add to Favorites Watch
View Karda's profile (online now)

Karda

1074 posts in 550 days


05-16-2018 11:14 PM

Hi I turned a bowl from black walnut, the whole log not just the center so the bowl contains a fair amount of sap wood. My problem is when i sand to 320, then steel wool the surface is still rough, not torn grain rough but not as smooth as it should be. The bottom I did with my rotary sander and the finish is much better. what should I do, I prefer to sand on the lathe. any ideas


7 replies so far

View Lee's profile

Lee

113 posts in 875 days


#1 posted 05-16-2018 11:39 PM

Well I’m not sure what happened, did you have a lot of end grain. I just finished a clock from black walnut with sap wood and it turned out fine. Sanded to 320, then ultra fine scotch bright pad, then Yorkshire grit, and finished with shine juice

.

-- Colombia Custom woodworking

View Karda's profile (online now)

Karda

1074 posts in 550 days


#2 posted 05-17-2018 12:22 AM

about the usual, but this is not the first walnut I have done and they all have a dull look to them, even the spindle work zi have done. I can never get the sheen I can on other woods. I know part of the problem is the sap wood, it looks dirty

View LeeMills's profile

LeeMills

542 posts in 1298 days


#3 posted 05-17-2018 12:33 AM

I have not had a problem getting a good shine on walnut if I want to.
My SOP is sand like you to 320. I then apply a wash coat or two (sanding sealer) of 1/3 shellac from the can with 2/3 DNA.
I use a jar lid with a little DNA and wet 4-0 steel wool and rub/burnish while the shellac is still wet.
When it drys (20 minutes?) I continue with 320 then 400.
You can apply almost any finish over the shellac. I normally just burnish again for a low luster or you can use friction polish or you choice of high gloss finish. I only use friction polish on small items not on bowls.

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

View LeeMills's profile

LeeMills

542 posts in 1298 days


#4 posted 05-17-2018 12:59 AM

Also, walnut is fairly porous which causes a duller look unless the pores are filled. For those who have a buffing system it is suggested to skip the middle (white diamond?) or your nice walnut will be filled with white bits and you may need to start all over.
The porous also can cause the “dirty” look in the sap wood. As you sand the darker is driven into the lighter wood. The light does not seem to show much in the dark. I like the contrast and give the sap wood a coat of sealer to keep the dark from filling open pores when I start on 320 or higher; or sand by hand if so enclined.

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

View Karda's profile (online now)

Karda

1074 posts in 550 days


#5 posted 05-17-2018 02:20 AM

thanks for the suggestions I have a good coat of friction polish on Ill sand again at 320 and see what happens thanks Mike

View LeeMills's profile

LeeMills

542 posts in 1298 days


#6 posted 05-17-2018 01:36 PM

If your friction polish is shellac/dna based you can use regular shellac on top to fill the grain. The friction polish I use is so thin it would take forever to fill the grain with it alone.
You may want to hand sand (or palm sander) the white section with 220 to get rid of the muddy look.
You can apply regular strength shellac and use the DNA and 0000 in a jar lid to fill the pores. You want it wet enough to spread (maybe like mayo) but not dry. With the 0000 just damp you are basically remove the excess and it will not leave lap marks. When it drys in a few minutes then start with your friction polish after first lightly sanding with 400 or burnishing with 0000.

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

View Karda's profile (online now)

Karda

1074 posts in 550 days


#7 posted 05-18-2018 03:44 AM

ok thanks I lightly sanded the bowl with 320 then steel wool and app[ied another coat of polish, it turned out better, the next walnut I’ll shellac first Thanks Mike

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com