Spray on Intumescent Fire proofing . We recently attended a class hosted by Sherwin Williams in Edison, NJ concerning there Intumescent Fire retardent coating. It was well attended and many questions and comments were brought forward. We learned about ratings and thicknesses based on steel type and coating thickness. Competitors such as Carboline and Albi were discussed as to the differences in application and initial coating thickness. We have applied other Intumescent coatings in the past and look forward to using Firetex.