NP-730 FIBER POLYESTER PUTTY – is a glass fiber reinforced putty featuring specially cut long glass fibers (6 mm) that impart exceptional mechanical strength and effective filling capabilities. Primarily designed for filling cavities and reinforcing surfaces impacted by corrosion or rust. NP-730 offers superior adhesion to various substrates, along with easy application and easy processing without clogging the abrasive in both manual and mechanical grinding processes.