This is a common problem with glycerin based soap that is left in any type of slightly damp environment. If the soap has a high glycerin content, as ours does, it will attract moisture from any environment it is stored in. Even sitting a bar near an open window for 10 minutes when it has been raining will cause the bars to get a ‘wet’ layer on them. Sadly, this cannot be avoided in certain situations. We can advise that by keeping the environment warm, or by putting the soap away, when not on display to sell, in an airtight box will help to stop the problem. Alternatively, you could cut and wrap each bar in cellophane.