i have been doing a lot of bottle slumping, and inevitably no matter how much I clean the glass I get a spot or two of devit. I tried super spray for a while with good results. Then I stumbled upon a formula for homemade devit, maybe even here in the forum or the on Paul’s blog I don’t remember. Since using the homemade borax solution ( 1 rounded teaspoon of borax in 1 cup distilled/RO water) i rarely have issues. I spray the front of the bottle and let it dy. And for the occasional time that I do get devit in a small spot, i respray the surface and refire it on a fire polish schedule and it is perfect!!! Much better than super spray and clear coat over glaze, and way cheaper too!
Jen in Florida