The SEM 39133 Flexible Primer Surfacer, a 13 oz. unit, is a highly versatile and effective primer that prepares surfaces for paint application like a pro. This versatile primer offers superior adhesion to both new and previously painted surfaces, ensuring a flawless finish every time. Its flexible formula allows for even adhesion on irregular or uneven surfaces, eliminating the need for sanding or roughing up the surface. The SEM 39133 is a great tool for general surface preparation, but it's also designed to maintain the structural integrity of bare metal or wood-based composites, making it an essential tool for automotive, construction, and marine industries. With its easy-to-use application and exceptional performance, the SEM 39133 Flexible Primer Surfacer is your one-stop solution for professional-grade surface preparation.