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Tung Oil film?

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Forum topic by oldnovice posted 1232 days ago 1090 views 0 times favorited 5 replies Add to Favorites Watch
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oldnovice

3620 posts in 1969 days


1232 days ago

Topic tags/keywords: finishing padauk tung oil

In February ‎14, ‎2009 I made a project consisting of a pine cone, painted to look like a rose, on a padauk base finished with tung oil, and a glass dome. Over this last weekend I saw this project again and saw that the glass dome had a film over the inside. I made another one of these about four years prior with a polyurethane varnished Oak base and it is still perfectly clear.

Considering that the pine cone was from the same tree, the same paint was used on the pine cone and the glass dome is glass. The only variables are the padauk versus oak and the tung oil versus the polyurethane varnish.

I theorize that the tung oil is caused this and wondering if anyone else ever seen this phenomenon or had any other insight as to what may have caused this film.

-- "I never met a board I didn't like!"


5 replies so far

View hObOmOnk's profile

hObOmOnk

1380 posts in 2728 days


#1 posted 1232 days ago

Are you talking about tung oil or tung oil finish – which brand?

-- 温故知新

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oldnovice

3620 posts in 1969 days


#2 posted 1231 days ago

The brand name on the tung oil is Jasco and it appears to be just tung oil, not a finish.

-- "I never met a board I didn't like!"

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hObOmOnk

1380 posts in 2728 days


#3 posted 1231 days ago

Pine cones contain resin that will off-gas. The polyurethane varnish most likely sealed better than the tung oil. I use a lot of tree products in my craft business, including pine and fir cones. I seal the cones with shellac. It is a great barrier finish for anything that might off-gas or emit odors.
You may be able to go back and apply shellac but first test that it will not disturb your paint and previous finish.

-- 温故知新

View woodjewelry's profile

woodjewelry

49 posts in 1509 days


#4 posted 1230 days ago

What was the weather like when you finished the piece?

I have done a lot of finishing with tung oil, and when the workshop is cold (you finished in Feb 2009) the oil can soak into the wood and not make a good film, this allows more oil from later coats to soak in and never really cure. If the workshop is cold, I usually leave the first coat 3 -7 days to cure. Also as Hobomonk says pine cones can have all sorts of resins in it.

Was the dome ever in direct sunlight, the heat would make any oils come out?

-- Mark, Lithuania, http://www.woodworkers-online.com

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oldnovice

3620 posts in 1969 days


#5 posted 1229 days ago

The only variables between the two projects are the wooden bases and the finishes.

#1 oak polyurethane

#2 padauk tung oil

I do see the point about the temperature since I work in a unheated garage and it was February.

I disassembled the project, sanded the base to get down to nearly clear wood (lost a little detail in the process) and applied four coats of Lacquer (actually looks better).

-- "I never met a board I didn't like!"

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