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-   -   How To Keep Bottled 100% Tung Oil From Oxidizing After Opening (http://forums.thecmp.org/showthread.php?t=214001)

MGMShooter 07-30-2017 09:14 PM

How To Keep Bottled 100% Tung Oil From Oxidizing After Opening
 
Executive Summary
Get it in plastic bottles, and squeeze all of the air out. Be sure the lip of the opening and the threads are coated so that an airtight seal will form.

It will not be easy to open the bottles years later, but it won't be like Loctite.



This relates to my M1A walnut stock project, so look for my other thread for the details on what I have done.


One complaint about tung oil -- I mean 100%-pure and not that misleading garbage at Walmart containing little tung oil -- is the fact that once opened, it "goes bad" from exposure to the oxygen in the air. True, pure tung oil isn't cheap at $15qt - $25qt so this is a real problem.

Most of you know that the "spoiling" tung oil is simply doing the same thing it does while in wood: curing. It is the same polymerization process that "spoils" oil in opened bottles/cans that makes the wood's finish so desirable.

I bought a 4oz bottle ~10 years ago for a couple of rifle stocks, and a 1qt bottle 3+ years ago for a wooden desktop. They were both in plastic bottles.

When I was done with each project, I squeezed the bottles until the oil was at the top, and I let a little spill onto the threads so that there would be good barriers. I didn't think it would work, but I figured it was worth trying.

But it did work! I didn't have to get new tung oil! That's two different bottles, one opened over 3 years ago and the other opened around 10 years ago that smelled and performed as well as new.

Maybe I got lucky; this is nowhere near a large enough sample. Maybe there was a preservative agent in them, but I bought them from different sellers over 5 years apart.

I hope this is something that works.

Neighbors 07-30-2017 09:43 PM

Another old time trick is to add marbles to reduce the airspace...

MGMShooter 07-30-2017 10:20 PM

Quote:

Originally Posted by Neighbors (Post 1625281)
Another old time trick is to add marbles to reduce the airspace...

That's a great idea!

Same concept, and, in most cases, easier. It isn't easy to cap a plastic bottle when there is a lot of empty space and you have to squeeze it

In light of this, I advocate buying tung oil only in plastic bottles, or at least pouring it into a compatible plastic bottle when done.

TLB 07-31-2017 05:38 AM

I buy in 16 oz bottles (volume price break) and buy cheap 4 oz bottles off eBay. Downsize into the 4 bottles and really only the working bottle is at risk.

GreekHXP 07-31-2017 01:01 PM

I store both tung and linseed oil in the freezer when not being used. Thaw and use as needed.

mac1911 08-09-2017 04:32 PM

I,take the chance and store them up side down.

GreekHXP 08-16-2017 06:56 PM

Quote:

Originally Posted by mac1911 (Post 1628232)
I,take the chance and store them up side down.

Keeping the oxygen out is important, but keeping the bacteria from having at the oil is also critical to long term storage.

BuddyBGood 08-16-2017 07:49 PM

Tung oil
 
So how do you know when and if it has gone bad?

GreekHXP 08-17-2017 08:20 PM

Quote:

Originally Posted by BuddyBGood (Post 1630610)
So how do you know when and if it has gone bad?

It won't smell like it did when fresh. Off smells if it goes rancid.

Jpm 08-18-2017 02:45 PM

This is exactly they way I've stored mine that I bought at least 3 years ago and its still good, just used some last night. Its getting to the point where I'm about to need to move it to a smaller bottle since this one is almost half gone and getting harder to squeeze out the air but maybe I'll find some marbles and do that instead.

Quote:

Originally Posted by MGMShooter (Post 1625275)
Executive Summary
Get it in plastic bottles, and squeeze all of the air out. Be sure the lip of the opening and the threads are coated so that an airtight seal will form.

It will not be easy to open the bottles years later, but it won't be like Loctite.



This relates to my M1A walnut stock project, so look for my other thread for the details on what I have done.


One complaint about tung oil -- I mean 100%-pure and not that misleading garbage at Walmart containing little tung oil -- is the fact that once opened, it "goes bad" from exposure to the oxygen in the air. True, pure tung oil isn't cheap at $15qt - $25qt so this is a real problem.

Most of you know that the "spoiling" tung oil is simply doing the same thing it does while in wood: curing. It is the same polymerization process that "spoils" oil in opened bottles/cans that makes the wood's finish so desirable.

I bought a 4oz bottle ~10 years ago for a couple of rifle stocks, and a 1qt bottle 3+ years ago for a wooden desktop. They were both in plastic bottles.

When I was done with each project, I squeezed the bottles until the oil was at the top, and I let a little spill onto the threads so that there would be good barriers. I didn't think it would work, but I figured it was worth trying.

But it did work! I didn't have to get new tung oil! That's two different bottles, one opened over 3 years ago and the other opened around 10 years ago that smelled and performed as well as new.

Maybe I got lucky; this is nowhere near a large enough sample. Maybe there was a preservative agent in them, but I bought them from different sellers over 5 years apart.

I hope this is something that works.



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