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6

I'm a firm believer in reusing jars used in finishing as much as possible. Especially very small jars that are handy for the small amounts of mixed finish that a single project often calls for, I will often go to the trouble of cleaning and reusing them. However, if the jars are common it often isn't worth the effort to clean them. While it sounds like it ...


6

I've found two products readily available in BC that one might not suspect to be denatured alcohol, but despite not having "denatured alcohol" written anywhere on the product, they are denatured alcohol. BioFlame: 95.6% ethanol, and 4.40% ethyl acetate. LV Lacquer Thinner: 91% ethanol, 4% butanol, %4 isopropanol. I'm not a chemist (please step in if you ...


3

Binder isn't a good word here as in coatings that means the stuff that bonds pigment particles together in paints, e.g. linseed oil in simple oil paints, acrylic/vinyl/styrene suspension in wall paints (US: latex paint, UK: emulsion paints). When shellac is used in between finishes to help with adhesion or ensure compatibility it's sometimes referred to as ...


3

Methyl hydrate = methanol. Also called wood alcohol. There is already methanol in most versions of denatured alcohol and in the general equivalent sold in the UK and elsewhere, and these are of course commonly used to dissolve shellac. And while methanol is quite toxic it is completely volatile, i.e. all of it evaporates, so none remains in a dried shellac ...


3

Can I apply a finish safely over top of these wax patches? Given their size (10mm diameter is a pretty big wax fill for finish to bridge over) and that it seems there are quite a few I think there's a good chance that you might run into a problem down the line, even with the very hard composition of most wax sticks. However that's just my thinking and you ...


3

Shellac applied in thin coats normally dries very quickly, but it won't harden completely if the shellac is too old. Check the can -- there may be an expiration date that'll help you judge how old it is. If the shellac has been stored in a warm place, like a hot garage, that can shorten its useful lifetime. You can check the condition of your shellac by ...


2

If you can redisolve the shellac by adding more alcohol, do so, then pour the resulting mixture into something disposable like an aluminum pie pan or even just a big wad of paper towel. Wait for the alcohol to evaporate, then dispose of the resulting mess in the trash. It still means throwing some stuff out, but a roll of paper towel is most likely cheaper ...


2

I’m finishing pine with amber dewaxed shellac (with a brush). I was hoping it would impart to the pieces the same color as the flakes after a few coats, but it’s still looking too yellow for my taste after 4-5 coats. FFR this is a general rule for shellac, the flakes are always going to be darker than the finish looks on a lighter wood unless it is built up ...


1

In the past I have used Shellac as a prelude to wax finishes but I am worried about how it might react with a final finish of varnish or lacquer (ie not wax or oil). There should be no problem there if you do want to stick with shellac. Generally speaking shellac will work under just about anything, it's actually widely regarded for its nearly unlimited ...


1

Even if you use various tests (solvent sensitity, scraping) to determine what a piece of vintage furniture currently has on it that doesn't mean it's the original finish and even if it were it doesn't mean you have to use the same thing. I think you should choose what to use now based not on what was original, but on what would work best for the piece for ...


1

Test in a unseen place with denatured alcohol if it is shellac it will soften.


1

Isopropyl Alcohol (IPA) seems to be fine for shellac and isn’t as toxic as methanol. It should be freely available anywhere - I got it from a high street chemist in the U.K. years ago, or get it from amazon etc.


1

Two additions to Grpahus's comprehensive answer: Skin absorption of methanol is also an issue (chemistry.se), so gloves should be worn. Latex isn't much good; nitrile and PVC are not much better but for short-term use are recommended by some sources. 100% methanol is worse than 10% in ethanol, though how much worse is another question (and one for ...


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