Slit Hole Scrap Master Casting Mold

The Slit Hole Scrap Master Casting Mold from Creative Paradise is a pot melt system designed to turn fusible scrap glass into large marbled kiln melts. The bowl portion sits on a prepared ring; glass loaded into the bowl melts and flows through the slit at its base down onto the ring below, blending the colors as they pool. The overall mold assembly measures 10.25 inches in diameter and 4.25 inches tall.

The finished melt can be used as a platter or cold worked into tiles and cabochons. Like all ceramic casting molds, it is COE agnostic and reusable across many firings when primed and cared for properly.

What does the Slit Hole Scrap Master mold make?
It produces a single large marbled glass melt per firing. The finished melt can be displayed as a platter or cold worked into tiles and cabochons once the kiln has cooled fully.

How does the slit hole design work?
Glass is loaded into the bowl, which sits on a prepared ring. As the kiln heats, the glass melts and flows through the slit at the base of the bowl down onto the ring below, blending the colors into a marbled pattern as they pool.

What COE glass can I use?
Any COE. Ceramic casting molds are COE agnostic, so this mold works with COE96, COE90, or other fusible glass. Match the firing schedule to your glass and adjust the anneal soak temperature for your COE.

How do I prep the mold?
Coat both the bowl interior and the ring with a boron nitride spray such as ZYP or a kiln wash such as Hotline Primo Primer, and let it dry completely before loading glass so the finished piece releases cleanly.

Specifications

• SKU: 152543
• Manufacturer: Creative Paradise (CPI.GM154)
• Makes: 1 large pot melt per firing
• Mold size: 10.25 inches diameter x 4.25 inches T
• Material: ceramic kiln casting mold, reusable
• Glass: any COE (COE agnostic)

Working Notes

These are guidelines, not guarantees. Every kiln fires a little differently, so test a small run first when the result matters and follow a casting schedule suited to your glass and kiln.

• Prime both the bowl interior and the ring with a boron nitride mold primer such as ZYP Boron Nitride Mold Primer, or a kiln wash, and let it dry completely before adding glass so the finished piece releases cleanly.
• Load scrap glass into the bowl, set the bowl on the prepared ring, and fire. The glass melts and flows through the slit at the base of the bowl onto the ring below, pooling into a marbled melt.
• The finished melt can be used as a platter or cold worked into tiles and cabochons once the kiln has cooled fully.
• The mold is COE agnostic. Use a firing schedule matched to your glass and adjust the anneal soak temperature for your COE.
• Let the kiln cool fully before removing the melt. Re coat the mold with primer as needed between firings.
• The Slide Hi Temp brand separator is not recommended with these molds.

Creative Paradise Suggested Firing Schedule

This is a suggested COE96 starting schedule, not a guarantee. Every kiln fires differently. Test a small run and adjust the schedule for your glass and kiln.

Scrap Master (COE96):

*Segment 3 is the anneal soak at 950 F for COE96. If using COE90, adjust this temperature to 900 F.

Helpful downloads: Scrap Master Tutorial (PDF) · Fill Weights for Casting Molds (PDF) · Casting Mold Tips (PDF)

Description updated: July 6, 2026

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