It sounds like you may have gotten a piece of glass that was not actually fusible. Every once in a while a sheet can get mislabelled as fusible when it is not. Some non-compatible glasses will fuse slump and drape beautifully with themselves, but you can not combine them. Others will get that matte finish, which is devitrification. Fusible glass is made so that it is way less likely to devit during the fusing process.
Fuse Master makes several products that can allow you to get a nice finish even on “non-fusible” glass. Back Magic matures at 975 F, Bending Glaze at 1100 F, Clear Coat from 1350 – 1550, and Super Spray from 1250 F (matte finish) or 1300 – 1700 F for a shiny – even incredibly shiny, surface. These aren’t cheap, but a little goes a long way.
Theoretically, you could take a piece with devit, abrade it (silicon carbide belt or hand pads, diamond hand pads, sandblasting), use Back Magic, heat it to 975, anneal it and get a shiny piece.
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