What it Does Is the glue hardening on your brush for Step 1 - Pro Base or Step 3 - Finish Gel? Our Brush Softener will take care of it and bring life back to the brush. How to Use Dip the hardened brush into the brush softener and watch it melt away the glue on the brush and it's good as new! Dry the brush with a paper towel before using it again. Fluid Ounces: .5 oz. Country of Origin: Made in US Ingredients: Acetone, Butyl Acetate