Castaldo® Rapido™ makes tough, strong PRODUCTION rubber molds in as little as 15 minutes. astaldo® Rapido™ is a soft clay or putty-like material that is easy to work with. Castaldo® Rapido™ produces highly detailed wax injections and need no release spray or powder. All of the tools and techniques for using Rapido™ are exactly the same as those used with our Super High Strength™, Econosil® and other silicone molding rubbers. There’s nothing new to learn and there are no procedures to change.