Mars Red Concrete Stain Concentrate 4 oz. Makes 20 Ounces of Water-Based Acrylic Stain No dangerous acid or solvent to deal with 20 stain colors to choose from - Interior Exterior Low odor, Fast air-drying, Fast delivery, NO Red Label, Low VOC. Compatible with solvent and water-based 1 and 2-component sealers like urethanes, acrylics and epoxy Shipping Refund: $5.00 back on 3 bottles, $10.00 back on 5 bottles.