I’ve had the same thing happen on my pieces. I planned to use these for jewelry and started looking for a website to see what solutions others have come up with for the same problem. The pieces came out with a white wash all over the top. My devit has been sitting for a couple of years so my question was can it still be used if I add water and thin it. My next plan is to sandblast the pieces, carefully clean them and refire them again to a full fuse. I’ll let you know what happens.