A flexible plasticizer additive designed to be mixed into primers, basecoats, and clearcoats when spraying bumper covers, mirror housings, fender flares, and other flexible plastic substrates — preventing cracking and chipping on parts that flex under impact.
Why Flex Additive Is Essential
Standard primers and topcoats cure to a rigid film. That’s exactly what you want on a steel fender — but on a thermoplastic bumper that absorbs minor impacts and temperature swings, a rigid coating cracks at the flex points within weeks. Flex Additive keeps the film elastic enough to move with the substrate without sacrificing adhesion or gloss.
Modern vehicles use flexible plastic on more body panels than ever — rocker extensions, wheel arch moldings, aero kits, running boards. Any time the substrate bends when you press it with your thumb, add Flex Additive to every coat in the system.
Mixing and Application
- Add 10–15% by volume to the ready-to-spray (reduced and activated) material
- Works with urethane primers, basecoats, and 2K clearcoats
- Does not affect color, gloss, or dry times at the recommended ratio
- Compatible with both solvent-borne and waterborne basecoat systems
- No additional catalyst or hardener adjustment required
I keep a pint of this at every mixing station. The one time a tech skipped it on a bumper job, the clear cracked at the license plate recess within a month. Never again.
Shop manager, Collision One, Las Vegas
Stocked in pints and quarts. A single pint handles approximately four to five bumper cover refinishes. Store sealed at room temperature — indefinite shelf life when kept below 90°F.
