It is possible to stick frit to slumped pieces. But soaking for a long time – several hours - at 650°C/1200°F is required to stick the frit. The added pieces will remain relatively sharp. You need to observe frequently from 600°C/1111°F to make sure that the form of the glass is not distorting.
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| Credit: Pyramid Gallery, Smyth and Zebrak |
Although it is possible, adding pieces to already shaped objects is not best practice, nor will it frequently give satisfactory results. If the slump is shallow, it is more possible to do this successfully than steep or highly shaped forms. But the most suitable practice is to flatten the piece, then tack fuse the pieces onto it. Follow this fusing with the new slump or drape. This flattening process will not be possible with all shapes.
The best results will be achieved by accepting what you have and make a new piece with the planned additions from the start.
This process will not be suitable for draped glass as the
glass will drape further during this low temperature soak.
I've a book that
gives more detail. Low Temperature Kilnforming, an evidence based approach to scheduling or at Bullseye
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