RELATED: What Happens to Your Nails If You Never Take a Break Between Gel Manicures. Unlike traditional nail polish, gel polish is cured under an ultraviolet (UV) or light-emitting diode (LED) light.
"BIAB usually comes in clear or colours like pink," says Nicholl. This is because, due to being a thicker gel, a UV lamp would struggle to penetrate pigment-rich BIAB shades and cure them properly.