The set contains 3 reagents and a rust effect powder to create rusty surfaces. Mix the powder into Primer Paste, Iron Paste or sprinkle on top of Repositionable Hobby Glue, or still wet pastes, paints, gels. Then drop the 3 reagents on top alternately. Use a soft brush to blend where the reagents meet. The reaction will start immediately however the final result will be visible after 24 hours. It is recommended to do trials before applying it on the designated object.