Professional Lacquer 2K TopcoatClass B s2 dO + Class O Clear, Woodshades & Opaque Lacquer for Spraybooth Application. Class B s2 dO + Class O Clear, Woodshades & Opaque Lacquer for Spraybooth Application. Available in a 40m unit. Product Description: A hard, wear resistant Fire Protection AC lacquer for application by professionals using brush, roller or spray. To be used over Thermoguard Fire Varnish Basecoat for INTERIOR surfaces. Product Uses: Hard, wear resistant Fire