Fusible Glass Supplies: what Claude and GPT would buy

Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.

Claude and GPT choose the same brand, Bullseye Glass

In Arts, Crafts & Sewing, Claude and GPT choose the same brand in 46 of 83 categories.

Claude Opus 5.5 · October 27, 2026

Bullseye Glass (brand)

Bullseye's COE 90 sheet, frit and stringer are tested for compatibility with each other, which removes the main cause of cracked fused pieces.

Not for: Anyone who already owns COE 96 or System 96 glass, because the two glasses cannot be mixed.

GPT 6.1 Sol · November 10, 2026

Bullseye Glass Tekta (line)

Versatile clear sheet glass for fused jewelry, offering a practical base for layering compatible Bullseye colors.

Not for: Projects mixing glass from untested compatibility systems.

Oceanside Glass (brand)

Oceanside makes the System 96 line, the main tested-compatible alternative to COE 90.

Not for: Studios already stocked with Bullseye or other COE 90 glass.

CBS Dichroic Glass (line)

Coatings By Sandberg is the benchmark dichroic coater and labels the base glass COE it coats on.

Not for: Beginners not yet confident with full-fuse schedules, because dichroic is easy to ruin and costly to waste.

Bullseye Glass ThinFire Shelf Paper (line)

ThinFire gives a smooth, clean release surface without re-coating the shelf with kiln wash every firing.

Not for: Those who want a textured back or fire many cheap pieces on a reusable kiln-washed shelf.

COE compatibility. Use only glass labelled with the same tested COE (90 with 90, 96 with 96), and never mix families or unlabelled glass. Mismatched expansion causes stress that cracks pieces, sometimes days after firing.
Tested compatible, not just labelled. Prefer manufacturers that test for compatibility. COE number alone does not guarantee it. Two glasses with the same nominal COE from different makers can still be incompatible.
Kiln type. Small microwave kilns suit tiny pendants only. Programmable electric kilns are needed for controlled annealing. Annealing is what keeps fused glass from failing later, and microwave kilns cannot control it.
Shelf release. Always fire on kiln wash or fiber/shelf paper, never on a bare shelf. Glass fuses permanently to an unprotected shelf.

Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.

Can I fuse window glass or bottles with my fusing glass?

Not together. Float and bottle glass have their own expansion. Fire them only with themselves.