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Lee Valley Polymerized Tung Oil and Sealer (Read 228 times)
 
Don Stephan
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Lee Valley Polymerized Tung Oil and Sealer
May 17th, 2022 at 6:53pm
 
Anyone have experience with these products?  Easy to apply?  How many hours between coats?  How many coats?  Durability?
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #1 - May 18th, 2022 at 9:40am
 
No experience with this specific product but from reading, it is just Tung oil that cures faster. Any application and/or sanding regime should remain the same, just less time in between coats.
As to the durability, Tung oil has been a proven wood protectant for about 2500 years.
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Don Stephan
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #2 - May 18th, 2022 at 6:01pm
 
Description of the recommended Polymerized Tung Oil Sealer says it can be mixed with Polymerized Tung Oil in differing proportions to obtain a balance of oil, thinners, and driers (and different sheens).  The literature suggests pure Polymerized Tung Oil begins to cure too quickly for large surfaces and for beginning finishers.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #3 - May 19th, 2022 at 7:31am
 
Don Stephan wrote on May 18th, 2022 at 6:01pm:
Description of the recommended Polymerized Tung Oil Sealer says it can be mixed with Polymerized Tung Oil in differing proportions to obtain a balance of oil, thinners, and
driers
(and different sheens).  The literature suggests pure Polymerized Tung Oil begins to cure too quickly for large surfaces and for beginning finishers.



I would want to know what driers are used in this product.

I use pure Tung oil, either by itself, thinned with turpentine, or as one of the ingredients in a shop-made Tung oil varnish (aka a 'long oil' varnish, or Danish oil).  When used alone or thinned with turpentine, I know that it is a pure vegetable product (it's Vegan!) and therefore food safe after it has cured. 

But when I see the word 'driers' I think of some kind of heavy-metal additive that I would want to understand better before applying it to my work.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #4 - May 19th, 2022 at 8:12am
 
Louie Powell wrote on May 19th, 2022 at 7:31am:
I would want to know what driers are used in this product.


These products don't have additional driers added, they go through a heating cycle to give the polymerization a kick-start. This is no different than BLO, which is not boiled but heat treated. They byproduct of the heat treatment is an increase in viscosity, which is why it requires thinning.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #5 - May 19th, 2022 at 11:24pm
 
I have used quite a bit of Lee Valley  (LV) polymerized tung oil, but now mix my own (oil, solvent and drier) due to cost.  Sutherland Welles (SW) manufacturers this oil and licences LV to package the oil with a LV label.

The SW and LV polymerized tung oils do contain driers, the polymerization reduces the need for driers, but doesn't eliminate the need if you want a quicker dry time.

From experiments on pure (no drier added) polymerized tung oil the dry time between coats for me was almost 5 days in a cool basement at ~65°.  This oil was from a manufacturer other than SW. Non-polymerized tung oil with no driers would take around 7-10 days under the same conditions.

With LV PTO, they would dry for me in 24hrs or less.  My procedure with PTO (both LV oil and my own mix) is to apply the oil with cotton rag, and keep applying (trying to saturate the wood) for about 10 minutes reapplying the oil to areas that rapidly absorbed it.  Then lightly wipe excess oil off with a paper towel and let dry.  The next day, buff with ultra fine steel wool, non abrasive pad or 400x sandpaper, clean surface and repeat. If you try to keep applying the oil past about 10 minutes, you will feel the viscosity increasing as you wipe and that means it's time to stop.

The number of coats I use varies widely from one to about eight coats depending on the wood and the sheen desired. Maybe three to four coats is average for me across a variety of woods.

You can use only a single coat and then buff much like many do with walnut oil, or apply more coats to increase the sheen.

BTW, I never bothered buying the sealer, it is just PTO than has more thinner.  Buy the PTO and thin it yourself.

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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #6 - May 20th, 2022 at 11:49am
 
Tim Connell wrote on May 19th, 2022 at 11:24pm:
I have used quite a bit of Lee Valley  (LV) polymerized tung oil, but now mix my own (oil, solvent and drier) due to cost.  Sutherland Welles (SW) manufacturers this oil and licences LV to package the oil with a LV label.

The SW and LV polymerized tung oils do contain driers, the polymerization reduces the need for driers, but doesn't eliminate the need if you want a quicker dry time.


So the description on the can,
"Formulated as the finest hand-rubbed tung oil wood finish (for brush use too), our Original Formula/Interior Polymerized Tung Oil is the first product that Sutherland Welles Ltd.® ever formulated, with no use of volatile organic compounds (VOC exempt)."

If you read further on,

"Our Original Formula line was our very first line over 50 years ago. We are still formulating the line much as we did then with some important improvements. We use very low toxic chemical driers and we now use a VOC exempt solvent that is virtually odorless. "

So the driers are there but in such low levels as to be exempt from having to put them on their sds.
I really wish these chemical companies would stop this and just tell use what's in the can in plain language.

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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #7 - May 20th, 2022 at 12:13pm
 
For those interested at looking into this subject
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #8 - May 20th, 2022 at 12:23pm
 
Driers may also be classified as trade secrets and are thus exempt from public disclosure.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #9 - May 20th, 2022 at 4:39pm
 
Tim Connell wrote on May 20th, 2022 at 12:23pm:
Driers may also be classified as trade secrets and are thus exempt from public disclosure.


I would think that metallic driers in any appreciable qty would be required to appear on the MSDS (material safety data sheet) in order to market the product, regardless of trade secret status.

But I'm no expert  Shocked
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #10 - May 21st, 2022 at 11:01am
 
Chris Brock wrote on May 20th, 2022 at 4:39pm:
Tim Connell wrote Yesterday at 09:23:22:
Driers may also be classified as trade secrets and are thus exempt from public disclosure.


I would think that metallic driers in any appreciable qty would be required to appear on the MSDS (material safety data sheet) in order to market the product, regardless of trade secret status.

But I'm no expert  Shocked


As far as I know, the ONLY things that can be committed from an SDS are chemicals that are listed on the known hazards list or are at levels low enough as not to pose any danger.

When I first started reading these sheets, (back in the 80's) they were MSDS sheets and they listed ALL the ingredients. Someone thought that there was no longer a need for this and here we are.
This is why most SDS for wood finishes have only the solvent and driers listed. If something is deemed to be non-harmful, (or in such low levels)  they don't list it and they're not required to.
There are very few companies that voluntarily list more than the minimum required, so much for an informed consumer, you can't find out even if you wanted to.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #11 - May 29th, 2022 at 10:03am
 
An email reply from Lee Valley confirmed there are additives in their Polymerized Tung Oil finish, but didn't identify them.  I'm going to assume the additives are one or more driers and one or more resins so the cured finish develops a sheen.  So I'll continue using thinned Old Masters polyurethane on my bowls.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #12 - May 29th, 2022 at 2:09pm
 
Don Stephan wrote on May 29th, 2022 at 10:03am:
An email reply from Lee Valley confirmed there are additives in their Polymerized Tung Oil finish, but didn't identify them.

That's pretty much what I would expect. You could try to email  Sutherland Welles and ask them, since that's what the Lee Valley product is, simply rebranded as Tim pointed out.
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They may tell you the same thing but it's up to you.
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #13 - May 29th, 2022 at 8:31pm
 
Don Stephan wrote on May 29th, 2022 at 10:03am:
An email reply from Lee Valley confirmed there are additives in their Polymerized Tung Oil finish, but didn't identify them.  I'm going to assume the additives are one or more driers and one or more resins so the cured finish develops a sheen.  So I'll continue using thinned Old Masters polyurethane on my bowls.


The additives are most likely only driers.  No added resins are needed, tung oil will provide a high sheen by itself with multiple coats.  BTW, tung oil is a resin by definition.
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« Last Edit: May 29th, 2022 at 8:32pm by Tim Connell »  
 
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Re: Lee Valley Polymerized Tung Oil and Sealer
Reply #14 - Jun 1st, 2022 at 5:20pm
 
Southerland Welles replied their polymerized tung oil has <.5% driers and anti-skinning agents, the product is about 40% tung oil and the rest citrus thinner.
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« Last Edit: Jun 1st, 2022 at 5:21pm by Don Stephan »  
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