Hi, I am a ceramic tile maker and I use a lot of commercial glazes in my work. I have been doing this for over 30 years and have found that I can almost always bring glazes back to a usable consistency by breaking up the pieces, adding water and mixing.
I am having a lot of trouble doing this with matte glazes in particular. We are finding that they tend to lift off the bisqued tiles. I have seen a lot of posts about using Amaco's gum solution. I have done this with mixed results. Recently, Darvan 7 was recommended.
I recently started using an immersion blender to do this, which seems to help, but it is a continuous challenge. Any suggestions or advice will be greatly appreciated.