When washing out sandcarving film, why do the small details dissolve, move, or delaminate?

This has several possible causes: most likely, underexposure or over washing. Underexposure can be corrected by following the exposure schedule listed in your instruction guide. The underlying cause of over washing is usually a lack of density in the artwork. This allows UV light to partially expose areas of film that should not be exposed. This increases washout time. Increasing artwork density helps improve results.

-Michael Sullivan, IKONICS Imaging