Legacy Industrial's HD6600-MMA™ Concrete Sealer is a "best in class" 30% solids methyl methacrylate that provides a high performance, fast drying, non-yellowing, sealer for indoor and outdoor concrete applications. HD6600-MMA™ can be considered the ultimate multi-use concrete sealer that has better chemical, weatherability and wear resistance compared to most solvent and water based acrylic sealers that are commonly used in the industry. Use this product for exterior and interior applications. NOTE: THIS IS AN IMPROVED VERSION & IS COMPATIBLE WITH PREVIOUSLY APPLIED HD6525/6600MMA SEALERS. 50 gal drums are NOT FREE SHIPPING, please contact us for LTL rate. LOW VOC VERSION IS: HD6500EXT.