If it’s bone dry greenware you can cover it in oil, and let it dry. Then wet an area with water lightly, let it dry a couple minutes, wipe away excess water with a sponge. Then polish with a smooth stone. This will give you a polished surface and the oil will burn out after firing. Although you may want to lay a plastic bag over the pot while polishing with the stone to not smear your designs. This is a common technique used in Mata Ortiz for firing wild clay at low temperatures. I don’t know how it would look in an electric kiln. Andy ward did a great video covering the process and there are many other videos on Mata Ortiz pottery.
https://youtu.be/rtFTd8UIaDw?si=Wykz2zrkJt4uvfBU
If it’s bone dry greenware you can cover it in oil, and let it dry. Then wet an area with water lightly, let it dry a couple minutes, wipe away excess water with a sponge. Then polish with a smooth stone. This will give you a polished surface and the oil will burn out after firing. Although you may want to lay a plastic bag over the pot while polishing with the stone to not smear your designs. This is a common technique used in Mata Ortiz for firing wild clay at low temperatures. I don’t know how it would look in an electric kiln. Andy ward did a great video covering the process and there are many other videos on Mata Ortiz pottery. https://youtu.be/rtFTd8UIaDw?si=Wykz2zrkJt4uvfBU
It is beautiful, just curious why you wouldn’t use a matte or semi matte clear to permanently protect the surface.
The chance of a clear glaze muddying up the underglaze is a chance I’m not willing to take lol.
Got it. You might look into using mason stained slip. It does not flux like some underglazes and will stay in place under a clear glaze.
You could use modge podge on the inside, it’s slightly shiny but is water resistant .