Cuccio Brush-On Builder Gel With Calcium enriched Builder Gel is an easy brush-on formula; applies like a soak-off gel polish looks like a hard gel and removes like an acrylic. Cuccio Professional LED/UV Brush on Builder Gel is a clear calcium enriched builder gel. This LED/UV self-levelling lightweight polish applies like a soak-off gel but has the strength of a hard gel. The easy brush-on formula makes beautiful strong manicures faster than ever.