Dip powder (also known as SNS, for the brand Signature Nail Systems) nails have grown in popularity, but before trying this trendy new service, there’s at least one woman warning to proceed with caution. Most dip powders are a combination of a glue-type liquid and powder that hardens when it hits the air, and leaves long-lasting color on your — nails minus the need for any ultraviolet (UV) lighting to cure or dry. There also isn’t the pungent smell that’s often associated with gel or acrylic.