I need to paint a new bumper. Is it possible to get flex added to the paint bought from paintscratch.com?

We no longer add flex to the clearcoat.

If you are spray painting a non-metal surface, such as a urethane bumper, you should order the Bulldog Adhesion Promoter as this is required for proper paint adhesion. The Adhesion Promoter is only required when you are spraying the paint and not for the touch up bottles and paint pens. Rubberized Primer is still recommended for unpainted non-metal surfaces and should be applied over the Bulldog Adhesion Promoter. Our clearcoat no longer requires the flex additive.