What is the meaning of waterproof?

fittydent Denture Adhesive and fittydent Denture Adhesive Cushions consists of two main components: Polyvinylacetate (PVA) and Carboxymethylcellulose (CMC). Polyvinylacetate is the adhesive. It works only on a dry surface to create the bonding effect (like chewing gum). To keep the mucosa dry, we use Carboxymethylcellulose (CMC) which works like a “sponge” to absorb moisture in the mouth. When the “sponge” is saturated with moisture, the mucosa becomes wet, Polyvinylacetate loses bonding effect and the denture stays in place only by suction. Now you can easily remove the dentures.