2 Qt Sherwin Williams Fast-Clad Zinc HS Primer Hardener (Catalyst) Part B por | 18 Jul 20262 Qt Sherwin Williams Fast-Clad Zinc HS Primer Hardener (Catalyst) Part B Note: This is a catalyzed product. It must be mixed with Fast-Clad Zinc HS Primer Part A prior to use. Mix ratio is 9A : 1B by volume.