The 18x9x1.5" mold was the first size to be offered in our silicone board mold collection. It's the ideal size for most epoxy resin or wood charcuterie or cutting boards but is also frequently used by resin artists to create trays and other art.
If you are looking for a slightly smaller mold we highly recommend cutting pieces of 1.5" thick HPDE plastic (or screwing two 3/4" pieces together) to create a spacer. For example, a 2x9x1.5" spacer will allow you to pour a 16x9x1.5" board in this mold, instead of cutting it down to size and wasting costly materials.
The last mold you will ever need. Created just for makers, resin artists and wood workers, these time saving flexible yet durable silicone molds significantly cut down on the setup and demolding time usually involved with other molds. Silicone molds are superior to wood and tuck tape, and HDPE molds because:
They can be used with epoxy resin, resin and wood, concrete, plaster and more.
They never need assembled, or disassembled. Saving huge amounts of time.
The strength and flexibility of the molds allows you to insert and remove pieces of wood easily.
The corners and edges never need sealed.
When using wood, the wood stays in place, tight in the mold if you cut it 1/16" larger than the width of the mold. Preventing the need for clamps or weights.
The mold is heat resistant (within reason!), and wont damage when you are popping epoxy bubbles with a torch or heat gun.
The molds are reusable. However silicone molds do have a finite lifespan when used with epoxy resin, but getting 20-30+ castings out of the mold can be expected when they are properly cared for and a mold release spray is used.
Like HDPE, epoxy does not stick to silicone. However in rare cases where the epoxy hasn't fully set (and is still mildly tacky) it can be harder to remove, and potentially create pits or small tears inside the mold when your piece is pulled out. Thus, we recommend the use of mold release spray before each pour to increase the life of your mold. We use the 'MG Chemicals 8329 Non-Silicone Epoxy Mold Release', or Smooth On Ease Release™ 200 which is readily available on Amazon.