The nature of the product is such that evidence of cloudiness, crystallisation or solidity could be present in the resin when you receive it. This is not a defect but a temporary change of state. The manufacturer advises that this is a natural occurrence, caused by being stored undisturbed, or changes in ambient temperatures, which can (and should) be completely reversed before pouring. A fully liquid state can be restored to the product by placing the sealed container in a reservoir of just boiled water. As the water cools, refresh the water with more piping hot water, repeating as many times as necessary until all lumps have dissolved. Once the resin is completely clear, it is vital you allow it to cool back to room temperature before following the manufacturer’s instructions for correct use. BEFORE USING GlassCast 10 EPOXY CASTING RESIN PLEASE ENSURE THAT YOU READ THE SAFETY AND TECHNICAL DATASHEETS WHICH CAN BE FOUND ON THE GLASSCAST RESIN WEBSITE.