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Hey AX, and others, how much Tung oil is needed for a typ. '53 box ? I am using white oak and have a supplier with 100% natural Tung oil as well as the modified oil with hardeners. I was thinking of using the one with hardeners as it is higher sheen, but it has mineral oil mixed with it. The write up explains that the hardners thicken the natural oil so in order for the product to work it needs mineral oil. My truck will see very little rain, but I live in central Ontario, so humidity and cold are my conserns. Any comments are welcomed. Jeff.
Is your tung oil rated for exterior use? IE does it have a UV screen? Sun is your worst enemy, not cold. We just had another member post questions abotu bed wood finishing. I'll copy my response on his post and past the three finishing links here as well.
Here's what I told him:
"This subject has come up a number of times and there are plenty of opinions.
First you need to go to the MAR-K site and look at their test results on finishing products and processes. They have made quite a study of it and have some very good results. Here's the link:
Thanks for the post Julie, Ive read them before and descided on Tung oil. What will UV do to an oil finish? My truck will live in a garage most of it's life. I will check the suppier's products for UV, but thought that UV deteriorates varnish, polys and other 'coatings' causing them to lift, peel and de-laminate allowing moisture to seep and blacken the oak. If oil penetrates, won't it repel moisture and lessen the chance of black grain in oak? Just curious, Jeff.
Thanks for the post Julie, Ive read them before and descided on Tung oil. What will UV do to an oil finish? My truck will live in a garage most of it's life. I will check the suppier's products for UV, but thought that UV deteriorates varnish, polys and other 'coatings' causing them to lift, peel and de-laminate allowing moisture to seep and blacken the oak. If oil penetrates, won't it repel moisture and lessen the chance of black grain in oak? Just curious, Jeff.
Yes you are right and I think we are saying the same thing, but I may not have expanded enough.
The tung oil is a great way to soak into the oak and provide a good hard finish that has PENETRATED into it - especially those open pours that turn black with moisture.
UV rays come from the sun and will EAT anything that is poly based. So what I was suggesting was that even if your truck is garage housed most of the time, it will still be exposed to the sun when driving and parked.
Make sure your Tung oil has a UV PROTECTANT (ie wood sun screen) added to it, to prevent UV/sun damage! That is to say make sure it is rated for Exterior use!
Hey Julie, the product is marketed in Canada through Lee Valley tools and there are exterior use application instructions, but I will have to e-mail for MSDS and tech info on UV inhibitors, thanks, Jeff.
1st any clear exterior wood finish will have to be redone every year or two dependent on how much it is exposed to the weather.
Use marine spar varnish.thin the 1st coat 75% thinner,2cd coat 50%thinnerand all the rest of the coats use the varnish full strength and use a brush,sanding between coats.put on 4-5 coats of Varnish.If you can stand the smell use turpentine to thin,it will drive the varnish deeper in to the wood.
After 40yr's in the trade I have found that marine spar varnish holds up the best.It also helps to wax after the varnish has dried about 60days.buy wax I mean something like Johnson Paste Wax
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