PERFECT TOUCH MICRO APPLICATOR BRUSHES Yellow Regular Perfect Touch Micro Applicator Brushes are used for placing etchants, sealatns, and bonding agents. Perfect Touch Micro Applicator Brushes are bendable in any direction to allow precise application in hard-to-reach areas. The fibers hold solutions, so there is no spilling, dripping, or waste. They are disposable and are intended for one use only.