A/D TC-55 Sealer may be used as an adhesive and/or sealer with cementitious sprayed fire resistive materials and insulation products. A/D TC-55 Sealer improves adhesive bond of fireproofing and insulation products to steel, concrete and other substrates. When applied as a topcoat/sealer, it improves most physical characteristics, reduces air erosion losses and may be used to color the fireproofing or insulation surface.