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Refurbishment of Antique Aneroid Barometer

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Russell Eberhardt19/10/2017 19:39:05
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Posted by Roger Hart on 19/10/2017 10:46:32:

Also, putting shellac lacquer on by hand is not so easy. The usual advice is to warm up the work, use your best sable brush and don't go over the work again. If you leave any places it will dull and look bad later on. If you go too slowly it will dry as you go and drag.

Yes, it takes a bit of practice but at least with shellac it is easy to remove with meths if you get it wrong. I find for large areas the cotton wool pads that the ladies use for removing makeup work well instead of a brush. The work has to be warm enough to stop blooming which I think is caused by the evaporating alcohol reducing the temperature and attracting moisture. Not hot though otherwise it will dry too quickly.

Russell

Samsaranda19/10/2017 19:51:44
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Old iron, many thanks for your input, just what I was looking for, someone who has done exactly what I propose doing. So it looks like Acetone is the first solvent to try and then when repolished I will obtain some Rustins Metal Lacquer and give that a go, wish me luck.

Dave

john carruthers20/10/2017 08:44:11
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I had dozens of barometers on my bench, mainly for new front glass, (bevelled, polished and drilled), sometimes for new silk thread. I replaced the 'jewels' on a couple but it's seldom worth the cost.
I would use Rustins metal lacquer with a touch of turmeric for colour to finish the brass. They do look well if you re-blue any rusty screws too.

Neil Wyatt20/10/2017 11:38:55
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Posted by John Haine on 19/10/2017 19:25:26:
Posted by Neil Wyatt on 19/10/2017 11:55:24:
Posted by John Haine on 18/10/2017 20:06:21:
Shellac dissolves in meths, not acetone.

It dissolves in both, but acetone is quicker and easier to use.

Meths safer though, and easier to buy in larger quantity?

Well acetone is permitted in food but meths is definitely not...

Acetone is also dead easy to get in big bottles at the supermarket, just don't buy the 'acetone free' nail varnish remover!

Neil

Samsaranda20/10/2017 15:05:24
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Hi John, thanks for the tip of using Turmeric in Rustins Metal Lacquer it should give it a nice antiqued look.

Neil I have found that there are many sources for Acetone, it is even available online from Amazon, just to digress it's quite frightening what chemicals are available by mail order particularly from EBay, such substances as 98% Sulphuric Acid, I haven't found Hydroflouric Acid yet but it is probably available somewhere on line and that would be really scary in the light of the current fashion of criminal activity in our major cities.

Dave

Neil Wyatt20/10/2017 15:19:19
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I have a nice big aneroid movement with a broken spindle, so I can't case it up and fit a needle.

Is it feasible to replace the spindle? I have visions of just destroying it just by looking too closely at it.

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