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Interesting technique using an open-backed bezel and silicone putty to capture the shape of a found organic object like shells or flowers. What makes this interesting is that the bezel is part of the (created out of silicone putty) mould, so the resin sets inside the bezel itself, so you don't have to try to fit the item inside the bezel. Then when the resin is set, you can fill in the other side, so that it is smooth on both sides. Another interesting aspect is that one could make something semi-translucent instead of completely opaque, possibly dusting the surface with mica powder, and you could get interesting effects when the light shines through it.

This is a video tutorial showing how to make handmade silicone molds for resin and clay. This method works for both flat and non flat pieces. The secret is using modelling clay as a base; that way the non-flat part of the master can be pushed inside the modelling clay and still lie flat. The frame can be pushed into the modelling clay also (no need for glue).

For resin use, make sure to use platinum cure silicone. If you use tin cure silicone, the resin may react to it and not cure properly. Polymer clay is NOT a good substitute for oil-based non-drying modelling clay since the silicone will react to it and will not cure properly.

How to make a mold for resin

This tutorial shows how to make a mold for resin and polymer clay. This uses Mold Star 16 fast from Smooth-on (liquid silicone mould maker) which is great for resin. Tips: using a ceramic tile as backing, cookie-cutter for frame, glue everything to the tile with white glue and hot glue.

How to make your own bangle bracelet form for molding in silicone - Resin Obsession This tutorial goes through how to make your desired shape for a bangle out of polymer clay (and bake and sand it) and then use that bangle form as the basis of a silicone mould.,