Plaster Elements in Fused Glass

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Sea Turtle Tray with plaster elementsUsing plaster elements in fused glass is an easy way to add variety to your basic stock of molds and shapes.  The little plaster elements are made using a mold, and a mixture of pottery plaster and silica flour in a 1:1 ratio.  However, you can also achieve excellent results with basic plaster of paris.

Molds can be made with a variety of different mold materials, including Mold n’ Pour, or latex liquid mold making material.  You can also make molds using silicone caulking and a few other ingredients.

The plaster elements should be dried thoroughly and then sanded flat on the bottom (wear a mask) to avoid overhangs.  Place the elements under your glass and fire to a full fuse.

After firing, when piece is completely cool, use a mix of vinegar and water to remove the plaster from your design.

Plaster can also be piped out of a pastry bag onto a piece of thin-fire, or a kiln shelf and then fused over.

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using plaster in a pastry bag for design

Recycled float glass lends itself well to ocean and under water themed designs.  But really, anything looks great!

recycled glass with plaster flower elements

Plaster seahorse inclusion in recycled glass

Plaster sea turtle element in recycled glass

Plaster shell element in recycled glass

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The recycled float glass at the top looks bubbly ,how does this happen as its an effect I would like to achieve

Also what exactly is recycled float glass?

Thanks B


Did you fuse the plaster portions at the same time you slumped into the bowl molds?  Or did you do it in 2 different steps?


Thanks,  K

GlassWithaPast moderator

 @barb24 Hi Barb;  The piece with the turtles has a solid rectangle of glass over wavy pieces with the plaster turtles under both layers.  'Recycled Float glass' is the term I use for float glass that has been used for something else previously.  In this case, windows.  When they were removed, I diverted them from the landfill stream, hence the recycling. I label it 'float' because older glass is not float and behaves differently. 


An alternate way to get bubbles would be to use a textured glass and fuse two pieces with the textured sides together.  The texture captures tiny regular bubbles.

GlassWithaPast moderator

 @kellbwm  The "pastry" piece was fused over plaster lines on a flat shelf and then slumped into a bowl mold.  All other items pictured were done in one firing using molds cut from fiber board with the plaster animal/flower placed in the bottom.

GlassWithaPast moderator

 @liesbethsingeling Hi Liesbeth;  That's a great question.  I don't, and get mixed results.  If you like the more frost look of the turtles in the first photo, don't use kilnwash.  The plaster may leave the glass with more of an etch.  (usually, but not always).  If you want a predictably clear result, like the last three small dishes, use kilnwash.  And make sure your plaster elements are quite dry, otherwise the water will evaporate and make a bubble on top of the element.  Let me know if that helped or just made it more confusing!


  1. [...] a fancy lid, place a plaster element between the bottle bottom and the fiber paper before fusing. This works best if the plaster element [...]

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