System Three's wax-lined paper cups are designed for measuring and mixing and not for storage. Most people will mix a volume as needed and apply it to the substrate well before it gets hot. Therefore, the wax coating is negligible. If a longer working time is needed, the contents should be poured into a wide containment such as a plastic paint tray. This will lengthen the pot life of the mixed epoxy and prevent it from getting too hot.
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