StartFill 2B is a dual-cure flowable composite ideal for when composite is inaccessible to light. Dual-cure chemistry allows for fast set with light-cure, or self-cures intraorally in approximately 2½ minutes. Flowability allows easy adaptation. As a cavity liner, shrinkage occurs towards the tooth. Excellent for luting crowns, posts and opaque veneers where light-cure is questionable.