FLEX100 can be used on its own or by mixing with our Rapid/Standard colour range to produce varying degrees of flexibility and firmness. Adding a small amount of FLEX100 to the resin would create a less brittle and more durable part. The more FLEX100 added the more flexible it will become.IMPORTANT: When mixing FLEX100 with RAPID RESIN please ensure that you cure for a long enough time to fully cure the flexible resin. This is a slower curing resin and takes more UV exposure to fully cure. Parts make look perfectly formed but cracks may appear overtime if the resin is under cured.