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Work piece has dry spots after Tung oil coatings

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Forum topic by BryanJP posted 04-26-2018 01:15 PM 290 views 0 times favorited 5 replies Add to Favorites Watch
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BryanJP

3 posts in 117 days


04-26-2018 01:15 PM

Topic tags/keywords: tung oil wood finish

I am finishing a few pine live edge shelves with Tung oil(first time using it). After five coats I have achieved the sheen and color I was looking for, but there are dry spot throughout he workpiece. Not sure if it’s from very dense grains or what but it gives it a very inconsistent or incomplete look. I need to seal/sheen those spots while still keeping the somewhat natural look to the wood. So poly and acrylic based are out of the question. Should I try an water based oil or laquer? Thanks!


5 replies so far

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John Smith

1256 posts in 249 days


#1 posted 04-27-2018 12:15 PM

Bryan ~ how long did you wait between the 5 coats of T/O ?
stop where you are – do not start adding finishes of different chemical makeup
or you may worsen the situation.
please explain how you have gotten to this point. also, age and condition of the wood, etc.
temperature and humidity plays a big part in finishes.

.

Note: any rags used in the prepping/finishing process that have paint, stain, solvents,
or oils on them, should be laid out in the open to completely air dry prior to discarding them.
improperly discarding rags that have wet oils and finishes on them could result
in spontaneous combustion that could result in a fire causing personal injury
or the total loss of your shop or home.

.

-- Graduated Valedictorian from the University of HardKnocks --

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BryanJP

3 posts in 117 days


#2 posted 04-27-2018 12:47 PM

I waiting 24 hours between coats as manufacturers recommended. Temp never dropped below 50 but as high as 70. Humidity may have been high one or two days due to some rain that came though my area. Im unsure moisture content of the wood since this is a project for a friend of mine and he bought the wood and brought it to me. I sanded the wood with 60 grit to 250. Is it possible that I just didn’t sand it enough. I would have loved to run it through the planer but mine is a 12’ and the workpiece is 13’. Could that have something to do with it?

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John Smith

1256 posts in 249 days


#3 posted 04-27-2018 01:03 PM

there have been several posts on this forum about Tung Oil issues.
the latest one is http://lumberjocks.com/topics/271594
and another one on SawMill Creek's forum
in some types of wood, temperature, humidity and method of application has everything
to do with achieving satisfactory results. Tung Oil can be very frustrating if not done correctly.
in some circumstances, 24 hours between coats is sufficient.
in other circumstances, 7 days between coats may be required.
also – proper thinning of the first 3 coats is often a good start to a satisfactory finish.

as to your question:
I think the sanding was adequate, but, not wiping off any excess oil every couple of hours
may have been a factor.

.

.

-- Graduated Valedictorian from the University of HardKnocks --

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BryanJP

3 posts in 117 days


#4 posted 04-27-2018 01:14 PM

Thanks for your help John. A lot to consider here…

View Rich's profile (online now)

Rich

3352 posts in 676 days


#5 posted 04-27-2018 02:07 PM

First of all, is it pure tung oil, or tung oil finish made by Minwax or Formby’s or someone else? If it doesn’t say pure tung oil on the label, and says tung oil finish instead, it likely contains no tung oil at all.

Also, provide a photo. Just saying dry spots doesn’t provide enough information.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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