In the Milestone Fusible Decals video, we provide a solution to mask the decal sheet border after firing which is to apply a thin layer of clear powder & re-fire to 1425°F for a glossy surface. I'm not entirely sure about what factors in it not burning out cleanly, if it's the style of glass it's fired on or certain decal runs or something else, but it's a relatively common issue that happens to varying degrees in our firings as well. Sometimes, there's little to no evidence of the decal sheet.
https://videos.bullseyeglass.com/videos ... le-decals/
I'm curious about firing a thin layer of powder in the same firing as the decal application firing as a preventive measure & will try that out. Following the recommended process temperatures, powder would fire glossy at 1450°F (metallics) & still have a bit of texture at 1375°F.
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