Temperature, Humidity, and Deft

Re: Temperature, Humidity, and Deft

Alan Tolchinsky

>Russ, I thought that the heat from the burnishing friction help set up Deft. In my basement shop (about 65 degrees) I had no problem; in fact I had the opposite. With the strong odor I experienced, this stuff must flash off very quickly. It was setting up very quickly in my shop. One question: Do you see see any problem applying a coat of wipe on poly a day after using Deft? I only ask this because your article describes applying the poly immediatedly after the Deft finish. Alan

Re: Temperature, Humidity, and Deft

Wally Dickerman at Green Valley, Az.

>A good afterthought post Russ. Temperatures are very important when applying some finishes. And it isn't 70 deg. here today, it's only 65. Bright and sunny though.

Wally

2 out of 3 anyway!

Ron Sardo in PA

>It's 12 degrees outside. But it's bright and sunny. With all the snow we have I need a welding mask for sunglasses!

No problem

Russ Fairfield

>I don't believe that there is anything critical about using an oil based finish over Deft, other than that the gloss should be removed from the Deft if it has been allowed to sit for a long time.

I usually apply the oil finish as soon as I have wiped the Deft to dry on the lathe. But, sometimes I will put a heavy sloppy coat of the wipe-on finishe on the wood before wiping any of the Deft from the surface, mixing them together, and then wiping both off at the same time; or sometimes I will wait a few days before putting on the oil based finish. Which I do depends on what I am doing, how many pieces I am doing, how much time I have, or what I feel like doing at the time. Sometimes I do different things just to prove to myself that it really doesn't make any difference.

Re: Temperature, Humidity, and Deft

Keith Tompkins

>Hey Russ, I often spray Deft outside, even in our frigid NE winters. I've noticed I can get a much finer finish (no orange-peel) when I spray in freezing weather, then bring the turning inside to dry. Apparently, the cold delays the drying of the lacquer enough to allow it to settle a bit. I haven't had any problem (yet) with moisture being trapped under the finish turning it white.

Wonder if you have had similar results?

Re: Temperature, Humidity, and Deft

Steve Mushinski

>Last winter (Ontario, Canada), I sprayed a bowl at a friends shop that turned white. We waited till it was dry to the touch before I walked out and put it in the car to go home. The next day it was foggy. After a week it was almost all white.

He had sprayed other turnings at the same time but they were left in the shop to dry and mine was taken out into the cold for about 10 minutes till the car warmed up. Our conclusion was it must have been the warm to cold transition that caused it to turn white.

Re: Temperature, Humidity, and Deft

Keith Tompkins

>Hey Wally, that's 65 degrees warmer than here in sunny New York State!

Re: Temperature, Humidity, and Deft

Russ Fairfield

>Yes, the cold will act the same as a retarding thinner, and that can allow more time for the film to level if it can be controlled. You will always run the risk of condensation of moisture on or in the lacquer when you return it to a higher temperature. That moisture is what causes the blush or cloudy appearance in the lacquer film. If you didn't have that problem, you were either very lucky or were doing all of the right things.

Thanks Russ. Alan

Alan Tolchinsky

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