Air Dry Clay (Water-based Clay) shelf-life can be 6 months to one-half year. It depends on how and where they have been stored.

Oil Modeling Clay (Oil-Based Clay) shelf-life can be for 5 years or more. Based on it is oil-based. It will never dry out and can reuse again and again.

If you have additional questions, we would love to hear from you!  If you would prefer to send us an email, visit our contact us page.