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Old 03-05-2011, 09:09 AM   #21
Dave
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Adrian, thanks for your comments. I have taken the liberty of pasting them into the closed thread titled "Don't restore your prop", as I think it's particularly relevant to that discussion.
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Old 03-05-2011, 09:18 PM   #22
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Hi Dave,

As some people reading this forum are not from USA nor Australia, it seems necessary to be cautious using "denaturated alcohol" : in Europe, denaturated alcohol has very different formulas according to the country it is sold. Read this : http://www.distill.com/specs/EU2.html
In France and in United Kingdom, standard denaturated alcohol contains water for about 10%.
In France, the bottles marked "Alcool 95" are, in fact, denaturated alcohol with 10% water, as "" are calculated in volume and "%" in mass. The difference came from a physical property: when you mix 1 liter of water and 1 liter of alcohol, you don't have 2 liters but only about 1.9 liter.

So, to make a good shellac, you have to buy in France "Alcool vernir 99 " (English word for word "Alcohol for varnish 99") which is 5 to 10 times the price of standard denaturated. But with "95", it don't evaporate quickly enough, and with "90", there is so much water the shellac goes whitish.

I don't know what you have to buy in United Kingdom. In France, if you live in the South-West or in the North, it seems you can buy good denaturated alcohol in Spain or in Belgium.

Regards,
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Old 03-06-2011, 07:24 AM   #23
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Thanks, Pierre.

I just realized that I can COPY posts into another thread (and they also remain here in this thread), so I've also copied your post above into the closed thread started by Bob some time ago titled "Don't Restore Your Prop"

This is a very useful discussion and should be archived as a "sticky" at the top of the list. I plan to also link the thread to the Wooden Propeller web site for reference.

Thank you both for sharing this very useful and relevant information!

Dave
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