Custom Building Products #381 Bright White 1 Gal. Fusion Pro Single Component Grout is a professional grade, single component sanded grout. Fusion Pro . Fusion Pro is a professional grade, easy to spread & single component grout. Learn about Custom Building Products’ stain resistant grout today. Discover the stain proof grout! The original Fusion Pro grout as well as the Fusion Pro Designer Series grout offer a patented, Single Component® formula that is . Amazon.com: Custom 221331 FP3811-2T 1G Bright White Fusion Pro Single Component Grout: Home Improvement. Its Single Component® formula is ready to use, color consistent and easy to spread and clean. Fusion Pro can be installed in commercial and residential . A result of the latest advances in grout technology, Fusion Pro is a pre-mixed, single-component, acrylic and silicone resin grout that never needs sealing.