Posted 15 April 2012 - 05:08 PM
Posted 15 April 2012 - 11:20 PM
I will say for even applications dipping/pouring is best for me -its the quickest as well-I have learned it well
second best is spray-thats the most even coating on a spinning wheel-but slow- I feel this is the most even everywhere-a bit harder to master
Brushing is the thinest unless many coats are used and the most uneven of the three-as well as the slowest.
I do lots of under glaze brush work but pour the inners and dip or pour the outers
Posted 16 April 2012 - 06:58 AM
Posted 17 April 2012 - 08:38 PM
You can add glycerin (available from a drug store/pharmacy) to make glazes more brushable; glycerin will add to the drying time, however. Other options are adding some gum arabic (available from arts/crafts store), or other commercial additives. Most of the glaze recipes you find in books, on-line, are formulated for dipping, not brushing. Ron Roy's Licorice is one of my favorites, but I dip, not brush.
Thanks for the info. I bought some gum arabic today and tried it. Seemed to work much better, but expensive. I'm going to try a commercial additive when I place my next materials order.
Posted 17 April 2012 - 09:39 PM
Kiln Repair Tech
Owner, Neil Estrick Gallery, LLC
Posted 18 April 2012 - 02:58 PM
I used to work as the tech for one of the pottery supply companies here in the midwest. Our line of brushing glazes used a combination of Vee Gum-T and CMC gum. They brushed beautifully. The problem with cellulose gum products or other organic gums is that they get eaten up by bacteria very quickly and lose their effectiveness. It can happen within a few days. You could add more gum as this happens, but it's not that easy because the gum must first be made into a syrup before adding it to the glaze, so eventually you'll just have way too much water in the mix. The commercial glazes all have some sort of biocide in them to keep the bacteria at bay. That's why commercial glazes smell the way they do. In the old days it was formaldehyde. Now they have other products, but they serve the same purpose. We used to get 5 gallon buckets of the stuff, which lasted us a year or two in production. I don't think you can even buy small enough batches to make it worthwhile from a cost perspective. Some people say that a small amount of copper carbonate/oxide added to the glaze will preserve it, but personally I have not found it to be as effective. Basically, it's difficult to make your own glazes that will brush as well as commercial glazes, at least in a long-term time frame.
Thank you Neil. Your comments have given me some ideas. Going to give this a try since I usually only mixed small amounts up to about 500 g.
Posted 18 April 2012 - 07:29 PM
Was it worth the trouble? Don't know, the project is on hold for awhile. As to the brushing medium, I don't know what it consists of but it wasn't very expensive (unlike the glaze!), and three coats brush on evenly.
Posted 18 April 2012 - 08:27 PM
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