Putty for cast iron and steel. Earn Epidian glue 5 with fine iron or steel filings to a thick mass. In this form, it can be stored as long as you like. Harden within a few hours after being added 10% (counting on the mass of Epidian itself) hardener Z1. The hardener should be thoroughly mixed with the putty. Perfect for filling cracks and scratches in cast iron and steel, because the cemented places are as durable as metals.