pit holes in fused glass

[ricklopez36]

hi everyone, I hope somebody can answer me…  I am trying to fuse resycle  bottle glass at the bottom of trays made out of clay…my kiln only reachs 1800F, but istead of have a smooth glass surface i end up with a bunch of holes ,and in some areas no cover with glass even when I put plenty of it…( seem like the glass is not getting as  liquid  as I thought even when i fuse it at 1800 for 2 hours) how can i get rid of these holes? you think if I add fist a coat of clear glaze the glass will spread better on the entire bottom suface. 

 thanks

[Anonymous]

Some bottle glass had an exceptionally high melting temp (compared to glass intended for fusing).

I recently tried to fuse some brown beer bottle pieces into a single “blank” — after 6 hours at the kilns top temperature of 1700° F I gave up.

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Paul
FusedGlass.Org
Helios Kiln Glass Studio
PaulTarlow.com

 

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