Contego Passive Fire Barrier (PFB) primer/finish is the most powerful fire barrier technology ever developed. The intumescent paint that stops fire through creating a char barrier. Contego has passed multiple substrate tests, including: ASTM E-119 test (steel), and the ASTM E-119/UL U-338 (drywall). Painters and contractors know to spec Contego Intumescent paint when looking to fireproof large and small projects.