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Reply by Wildwood

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Posted on why/when should I use tung oil?

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Wildwood

988 posts in 760 days


#1 posted 649 days ago

Pure Tung oil is a drying oil, takes time to dry & cure. Matt or satin finish about all can expect, will develop a patina after several years of re-application. Pure Tung oil is easy to apply & repair. Same can be said of polymerized Tung Oil, about the same except dries faster.

Adding solvent to either pure or polymerized Tung oil increases penetration into wood and speeds up drying times.

Oil varnish blends contain oil, resin, and solvent. May or may not contain Tung oil, have to read label on can or check out material safety data sheet MSDS for list of ingredients.

Many oil varnish blends contain cheaper non-drying, semi drying oils, drying oils. Have seen products that contain real small amounts of both Linseed & Tung oils which seems silly because these oil dry differently, but does not matter because amounts so small.

http://apps.risd.edu/envirohealth_msds/MetcalfStore/WatcoDanishOilNatural.pdf

Wiping Varnish contains resin & solvent (varnish-poly). Usually no oil in a wiping varnish, so check ingredient list. Never want to buy a wiping varnish that is over 60% solvent.

Here is a Tung oil wiping varnish with 69% mineral spirits and no other ingredients listed.
http://hazard.com/msds/f2/ckc/ckctz.html

Another Tung oil wiping varnish product without any Tung oil
http://hazard.com/msds/f2/brx/brxhq.html

http://www.popularwoodworking.com/techniques/finishing/oil-finishes-their-history-and-use

When to use depends upon project and product selected, not sure any rules other than understanding end results.

-- Bill


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