Lip Balm sinking/shrinking
A client has provided me with a formulation for a lip balm they wish to begin manufacturing - the problems arise as it has to be poured straight into push-up cardboard tubes rather than into moulds. Observing drastic shrinkage resulting in an unsightly hole at the top of the stick. My question is; are there formulation tweaks I can make to improve this, or does it solely come down to fill temperature/cooling process?
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