Originally Posted by Looneybomber
How does this work when trying to put a mirror finish on the veneer? Is it possible or would urethane be best?
Most of the tung oil finishes do have urethane. So the more coats you use the more gloss you get. The advantage of the tung oil, or any other oil, is that it penetrates the wood or veneer much deeper than urethane alone can do.
Vintage JBL cabinets all used a plain cocktail of boiled linseed oil and turpentine. Very effective at penetrating and preserving wood but stinky like stinky never was. Also needs to be re-done regularly to maintain. Oils with urethane will seal the surface against dirt, sun, etc and last a lot longer. But plain urethane does not penetrate the wood. Hence the combination of oil and urethane.
It is applied a little differently from what is shown in the video. You basically rub it into the wood with a cloth or with bare hands, wait ~30 minutes and wipe off the excess. Repeat at least three times while waiting 24 hrs minimum between coats. Pure tung oil will produce a low-sheen finish.
The problem with the "wait to wipe it off" technique is that some of it will dry and get tacky. So you need to be sure you have enough on the surface to avoid drying before you wipe. It can get pretty drippy, so I prefer to wipe sooner and do multiple coats to get the same degree of penetration. You can re-coat any time.