Sealing ceramic items after glaze firing
Hello. I hope you are well.
I'm brand new at ceramics. I've made some "collars" - clay rings about eight inches in diameter and about four inches high - to put around garden plants. (This is to conserve water by keeping it right at the plants' bases.)
The bottom edge of the rings are unglazed because I learned that glazing the bottom edge would cause them to stick to the kiln shelf. I need to seal the unglazed edges so that they don't absorb water and then fracture when water freezes n
In my exhaustive search for epoxies and varnishes and sealers that won’t yellow (I make large scale sculptures that have to be fired in sections and put together after glazing, doing cold finishing to cover the seam and match colors and glaze glossiness) I found every day thing yellows except aliphatic polyurethane. Now, your situation that doesn’t matter because they won’t be exposed to UV light. But they are great waterproofers, they withstand chemical attacks so well they are used on murals t
