Sherwin Williams Coupons: Buy 1, Get 1 Free & 25% off February 10, 2011 by iGoBOGO Is a painting project in your near future? You might want to print these Sherwin Williams Coupons while they’re still available. Buy 1, Get 1 Free Roller Cover & Dropcloth 25% off Paints and Stains 15% off Painting Supplies Click on the Household Category to find them easily.