Fast N' Firm™ 3M Fast N' Firm™ is a product line from 3M, a diversified technology company that operates globally. 3M is known for its innovation across various industries, offering a wide range of products such as abrasives, adhesives, sealants, fillers, advanced materials, and much more. The company focuses on using science collaboratively to improve lives and address the world’s challenges in various sectors, including automotive, electronics, health care, and consumer markets. The Fast N' Firm™ Seam Sealer is one of their automotive products designed for sealing exterior joints and seams.