Can You Waterproof Existing Drywall?

Can You Waterproof Existing Drywall? Can you waterproof existing drywall? Drywall can be primed and painted to be waterproof. Although water resistant drywall — commonly referred to as greenboard or blueboard because of its color — is available at most home improvement stores, you may find yourself needing to waterproof your current drywall. Can you