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Friday, December 4, 2009

We just listed 2 new silicone molds!

Silicone molds may be a little tricky to begin with, but I think they will be well worth the effort. The molds are made from a tin silicone that has a long shelf life and tough enough for many pulls. The molds are handmade by me.


Faceted Silicone Bangle Jewelry Resin Molds Mold Mould



Normally a release agent is not needed for plaster casting, but for urethane and resin casts, or complicated molds with severe undercuts or many crevasses, a release agent such as thinned vaseline and or barrier coat (such as varnish or paint applied to the mold before casting) is advisable.

TIP: Because the molds are small you may want to warm them slightly, a heat gun, microwave, or toaster oven will do. Squeeze the molds when filling to give you a little wider opening. Once filled about half way, roll the resin around to avoid trapping any air bubbles.

You can use a craft stick or a pair of tweezers that opens when pinched to make the opening wider when filling with resin. Once filled to top, lay a piece of glass over the top, this way when the resin has cured you can just snap the flashing off the cured casting. Or if you prefer once the casting has started to cured and there is an indentation from the shrinkage add a little bit of resin to fill in so you don't have to do any sanding.

Take the casting out of the mold once it has started to harden by slowly peeling the mold from the cast. Work around all the edges before pulling up the middle sections. Removing the casting early will produce a shinier casting if it doesn't touch anything while finishing to cure.

After a cast is made, be sure to thoroughly clean the mold (removing any casting residue or release agent) before storing. Clean your molds with dish soap and water. To remove fingerprints and such you can use rubbing alcohol. Store silicone molds in a clean, dry location, embed a rigid mother mold cast if possible to hold the molds shape. This prevents the mold from distorting or warping over time.

You will get the least amount of pulls from silicone molds when using Epoxy resin. More pulls when using polyester resin. Even more pulls when using polyurethane resin. Try to take castings out of silicone molds as soon as possible to extend the life of silicone molds.



2 pc Silicone Resin Bubble Ring Jewelry Mold Mould SZ 6



The red ring pictured is a finished sample and does not come with the mold. Finished ring is a size 6.


Mix and pour the casting material according to the manufacturer's instructions. Fill the bottom part with resin. You may want to wrap with a rubber band to close the slit in the plug a little more. You will need this slit to remove the ring from the mold. You may have a bit of flashing from the slit when you remove the casting but that can be easily snapped off.

The top bubble part of the mold can be filled in layers and embedded with goodies. Once the top and bottom have reached the gel stage apply a small amount of resin to the castings and join the two halves. Use cardboard or other stiff backing so the molds are properly matched when rubber banding them together for curing. Or you can rubber band together and pour resin in the pour holes which is a little more advanced technique.

Take the casting out of the mold once it has started to harden by slowly peeling the mold from the cast. Work around all the edges before pulling up the middle sections. Removing the casting early will produce a shinier casting if it doesnt touch anything while finishing to cure.


If you have any questions feel free to e-mail me or give me a call.

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