This premium body filler is formulated with ECORESIN technology, allowing for an extended work time of up to 40 minutes at 75°F. It offers superior adhesion and is incredibly easy to sand with 80-grit sandpaper. Work Time: Up to 40 minutes. Sand Time: Approximately 120 minutes at 72°F.Max Thickness: Recommended at \(\frac{1}{4}\) inch or less. Substrates: Works well on bare steel, galvanized steel, aluminum, fiberglass, SMC, and properly prepared OEM paint. Hardener: Must be mixed with cream hardener at about 2% by weight.