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post #1 of 9 Old 02-09-2012, 10:09 PM Thread Starter
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Hello from Pa

I'm a carpenter by trade, mostly commercial work. I have found that forum boards are one of the best ways to gather information. The members that use them are usually passionate about thier hobby or carear and have access to great knowledge.

I came to this site for an odd reason. My family races in Soapbox Derby. In the past the cars floorboard was allowed to be finished with Tung oil only. Then the rules changed and tung oil was no longer allowed. The rules have changed again and tung oil is once again allowed.

My question is this. What should I do to a new floarboard, with no finish on it at all, to prepare it to be finished with tung oil. I want the board to absorb as much as possible. The more it absorbs the heavier it gets, the better for racing. The wood is a soft fast growth wood. Not sure what type. It's like a butcher block with 1" wide strips finger joined and glued together.

Do I wet the board? Heat it? Thin the first coat?

If this should be in a different section I apologize.

Thank you,
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post #2 of 9 Old 02-10-2012, 08:00 AM
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welcome to the forum. I personally don't know of a method to allow greater fluid absorption, tung oil appears to absorb so much then stop. I doubt if it coud absorb enough to make a considerable difference in weight that could not be added elsewhere (allowed). if not allowed, maybe look for a baseboard wood species with a higher density (wt/volume)
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post #3 of 9 Old 02-10-2012, 08:03 AM
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Welcome to the forum.

Sent from my iPhone using Wood Forum
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post #4 of 9 Old 02-10-2012, 08:34 AM
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post #5 of 9 Old 02-10-2012, 10:11 PM
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I personally use Bush's Oil treatment, but assuming that the techniques you use with that are the same, I would sand progressively with 80, 120,180, and 220 grit, and then apply oil and wet sand with 400. Wipe the oil off after 20 minutes, and repeat as necessary. Finish without sanding and leave oil to dry to hard surface for 24 hours.
Try on sample piece first, and let me know how that works.
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post #6 of 9 Old 02-11-2012, 12:12 PM
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Do the rules allow you to thin the tung oil? BTW, I'm assuming that you are referring to real, pure tung oil, not one of the faux Tung Oil Finishes like Minwax Tung Oil Finish. These products are not tung oil at all, they are linseed oil and varnish.

The only way I know of to promote deeper absorption of an oil is to heat it. Heating is makes in more viscous and it should penetrate more deeply into the wood. However, if the piece you are oiling is plywood, the adhesive that glues the plies together will act as a barrier to the oil getting past the first ply.

If you have a reasonably accurate and sensitive food scale you could run some tests. Try different things and weight the the panel. See which treatment gives you the best result.

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post #7 of 9 Old 02-11-2012, 03:11 PM
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ive never used tung oil before but i imagine if you thinned it it would penetrate better. Aslo if there was any way to soak the entire piece of wood in if for mabe a day or 2. Just an idea.
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post #8 of 9 Old 02-11-2012, 03:12 PM
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Just curious if you dont mind me asking, where in pa are you from im from mechanicsburg area.
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post #9 of 9 Old 02-11-2012, 09:28 PM
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