Dynatron ULTIMATE FILLER is a stain-free, tack-free, super premium lightweight filler that offers the industrys best adhesion to steel, galvanized steel, aluminum, E-Coat and SMC. The smooth, creamy texture of Ultimate Filler makes it easy to apply and a breeze to sand. Dynatron ULTRA-GRIP is a high-tech lightweight filler formulated specifically to offer enhanced adhesion to difficult surfaces such as galvanized steel, aluminum and E-coat. Dynatron DYNA-PLUS is an attractive gold formula, stain-free, tack-free premium lightweight filler that offers excellent adhesion to steel, galvanized steel, aluminum, E-Coat and SMC.