【 Easy-to-Use Hobby & Craft Putty 】 Due to its versatility, ease-of-use, and quick-curing properties, Tamiya Polyester Putty has become an indispensible tool for model builders. Tamiya has now packaged this putty in a new, smaller 40g tube that can be conveniently used up in one or two projects, thereby eliminating waste. A 4g tube of hardening agent is included for mixing with the putty prior to application. Yellow-colored putty can be used to fill holes and cracks, and quickly cures in 1 hour.