denatured alcohol formulation
#6
  
I've been watching lots of Tom McLaughlin's videos on YouTube lately. He was discussing the use of shellac and mentioned that not all denatured alcohol has the same formula. They all have a mix of ethanol and methanol and Tom was saying that the higher proportion of ethanol, the better it is for cutting shellac. 
Sometime recently it has all become "appliance fuel" with a 50:50 mix of the two types of alcohols. 

Is anyone else aware of this change? Is it the case that this new formulation is inferior for cutting and spraying with shellac? Does anyone know where to find denatured alcohol that is meant for shellac?
How do you know you're learning anything if you don't screw up once in awhile?

My blog: http://birdsandboards.blogspot.com/
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#7
  Re: denatured alcohol formulation by mr_skittle (I've been watching l...)
The FDA has a whole list of denatured alcohol formulations. Most of what is sold in the box stores is mostly methanol with a couple drops of ethanol. The link below is one I get form Amazon that has no methanol. They make both a 190 proof and a 200 proof formulation. This does contain a chemical that makes you nauseous which is one method for "denaturing" since it makes you not want to drink it. This chemical is a lot safer than methanol. I always spray with a simple N95 respirator and have not had any problems. One day I did do some wiping without a glove and I felt a little queasy for a couple hours.

https://www.amazon.com/Denatured-Alcohol...841&sr=8-8
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#8
  Re: RE: denatured alcohol formulation by CEPenworks (The FDA has a whole ...)
(09-14-2021, 06:17 AM)CEPenworks Wrote: The FDA has a whole list of denatured alcohol formulations. Most of what is sold in the box stores is mostly methanol with a couple drops of ethanol. The link below is one I get form Amazon that has no methanol. They make both a 190 proof and a 200 proof formulation. This does contain a chemical that makes you nauseous which is one method for "denaturing" since it makes you not want to drink it. This chemical is a lot safer than methanol. I always spray with a simple N95 respirator and have not had any problems. One day I did do some wiping without a glove and I felt a little queasy for a couple hours.

https://www.amazon.com/Denatured-Alcohol...841&sr=8-8

Thanks for the link. I'm hoping to find something local but at least now I have somewhere else to get it. At $40 a gallon, it's about half the price of the Everclear I got to use in the meantime. A place called Woodfinishing Enterprises has some as well but it's pretty pricey at $14/qt.
How do you know you're learning anything if you don't screw up once in awhile?

My blog: http://birdsandboards.blogspot.com/
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#9
  Re: RE: denatured alcohol formulation by CEPenworks (The FDA has a whole ...)
(09-14-2021, 06:17 AM)CEPenworks Wrote: The FDA has a whole list of denatured alcohol formulations. Most of what is sold in the box stores is mostly methanol with a couple drops of ethanol. The link below is one I get form Amazon that has no methanol. They make both a 190 proof and a 200 proof formulation. This does contain a chemical that makes you nauseous which is one method for "denaturing" since it makes you not want to drink it. This chemical is a lot safer than methanol. I always spray with a simple N95 respirator and have not had any problems. One day I did do some wiping without a glove and I felt a little queasy for a couple hours.

https://www.amazon.com/Denatured-Alcohol...841&sr=8-8

It's been a while since I looked at TDS and such for Kleen Strip and Sunnyside but maybe a few years ago is got to a 50:50 mix with methanol. The smell certainly changed. So far, other than I can't use a foam brush any more (using old t-shirt cotton pad applicators on small stuff, Taklon brush or spraying on larger) I haven't noticed any difference in application or durability. But then I'm not exactly stress testing stuff either. Wear a filtered mask or respirator when spraying and I only do it outdoors. Nitrile gloves when hand applying. 

Side note about gloves, a while back somebody complained about the nitrile gloves being slowly dissolved (I think they complained of pinholes appearing) by the methanol. As an experiment I blew up a glove like a balloon and tied it off. Then put the finger in a mason jar of Sunnyside and used tape and rubber bands to hold it in place. After a day it was still holding air, no holes. Not an exhaustive test and maybe something I should repeat with a recently purchased can.
Don't sweat the petty things and don't pet the sweaty things. -- G. Carlin
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#10
  Re: denatured alcohol formulation by mr_skittle (I've been watching l...)
I'm not entirely sure if I need to be making a fuss about the formula or not. I've not really done enough finishing, or at least often enough, to notice a difference anyway. In these instances I have to go with what professionals recommend. As I attempt to make the transition from hobby to professional furniture maker, I want to do whatever I can to ensure the best possible finish.

As far as gloves, I've never had any trouble with anything but lacquer thinner. They last about 5 seconds in that stuff.
How do you know you're learning anything if you don't screw up once in awhile?

My blog: http://birdsandboards.blogspot.com/
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