Norma Ontiveros and the nail technicians at Avida Salon & Spa have honed their craft for a decade while staying hip to advances in the field such as CND's Shellac polish. Shellac lacquer resists chips for up to two weeks, and its hypoallergenic formula eschews three chemicals common in conventional polish, including formaldehyde. After trimming overgrown cuticles into natural sundials, technicians glaze nails in three coats of clear lacquer, curing each layer under a UV lamp. Groupon customers hoping to dress their digits in Shellac colors such as the steely Asphalt or crimson Wildfire may purchase upgrades ($10 for hands, $15 for feet). The transformation takes about 90 minutes and leaves digits sheathed in glassy cases, their natural beauty pristinely preserved until kissed by a prince's acetone-soaked cotton ball.