The perfect body is, at last, ready and bottled. Unite has created a “next generation” powder spray that instantly dries into a weightless and workable styling tool called Liquid Dust ($27).   According to the company, it’s the ultimate in control, lasts all day, and offers the power to sculpt incredible body and volume with or without heat, on wet or dry hair.   “What’s innovative about Liquid Dust is that it’s a product with actual memory,” said company founder and CEO Andrew D...