If used by themselves, epoxy coatings will reduce, or eliminate, moisture migration through concrete floors and wells (through the concrete itself, not when migration is through the cracks). Epoxy coatings are used on concrete that is always a bit damp and to end the 'musty' or damp smell in basements, etc. Perhaps more importantly, but less obvious, is that by using sealants to reduce or eliminate moisture movement through the concrete, the likelihood of a successful paint or coating job on the concrete surface just below epoxy coatings increases.