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Tung Oil Problem

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Forum topic by crazicarl posted 12-18-2013 03:06 PM 816 views 0 times favorited 9 replies Add to Favorites Watch
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crazicarl

22 posts in 1470 days


12-18-2013 03:06 PM

First, I love LJ. I visit several times a day and love to check out what all the craftsmen in the world are making. It’s truly inspiring; keeps me thinking about what I can do next or different.

That said, I’m a novice at best and I’m finishing a walnut bench with tung oil. Every coat was diluted 50% mineral spirits. The first two coats went on fine, but I put on a third and fourth and noticed that the finish is . . . for lack of a better word, powdery. Powdery and white. As in, I can scratch the wood with my fingernail and it leaves a white powdery streak.

What have I done wrong? I’ve tried rubbing the finish down with mineral spirits alone and wet/dry sandpaper thinking I had let too much finish build up, but still with the powdery white. The wood is super smooth and when wet looks amazing, but as it dries . . . just looks dry and white and powdery. Any advice would be appreciated. I can post pics if need be.

Thanks in advance, guys.

Adam


9 replies so far

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bobasaurus

2675 posts in 2651 days


#1 posted 12-18-2013 03:17 PM

What is the exact brand/source of your tung oil? It might really be a water-based varnish made to look like tung oil, in which case thinning with mineral spirits won’t work very well. Also, how old is it? Did it ever freeze in a cold garage? You might just have to buy some new finish.

-- Allen, Colorado

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dbray45

3187 posts in 2243 days


#2 posted 12-18-2013 03:27 PM

Real tongue oil won’t do what you describe – that I have seen.

Could it be “tongue oil finish” product?

-- David in Damascus, MD

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crazicarl

22 posts in 1470 days


#3 posted 12-18-2013 03:38 PM

I have 100% pure tung oil from Woodcraft. Bought it maybe a year ago, never frozen. I’m goingto try attaching some pics to illustrate my problem a little later. Thanks guys.

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crazicarl

22 posts in 1470 days


#4 posted 12-18-2013 03:42 PM

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crazicarl

22 posts in 1470 days


#5 posted 12-18-2013 03:43 PM

This is my first nice piece of furniture, so I really want it to finish out nice. Thanks again, guys.

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lumberjoe

2893 posts in 1715 days


#6 posted 12-18-2013 03:44 PM

How long are you waiting between coats? Pure tung oil takes several days to polymerize in ideal conditions. Also is there a specific reason you are using Tung oil?

-- https://pinepointwoodworks.wordpress.com/

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bobasaurus

2675 posts in 2651 days


#7 posted 12-18-2013 04:23 PM

What is the temperature in your finishing area? If it’s very cold, I could maybe see this happening… otherwise maybe it’s a lack of surface prep, like dust stuck in the pores getting pulled into the finish?

-- Allen, Colorado

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crazicarl

22 posts in 1470 days


#8 posted 12-18-2013 04:45 PM

Joe, I only waited a day between coats.

Allen, surface was very clean prior to finishing. Area was a littlecool, but never below 55

Really, I just want to know how to fix it. I do not want to have to sand it down to bare wood, but if I have to …

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crazicarl

22 posts in 1470 days


#9 posted 12-18-2013 10:06 PM

Ok, put a fresh coat of tung oil on and it looks great. After I get it.upholstered, I’ll post it as a project. Thanks for being a soundboard guys. I think the mineral spirits just dried he.fimish out.

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