Abstract: A dual color sprayed on composite ceramic coating configured and formulated to protect fireside boiler tubing while also acting as a visual inspection aid. The coating is an environmentally safe, non-reactive, water soluble composite ceramic that will withstand operating temperatures up to 2000° F. (1093° C.). This coating is ideal for fluidized bed boilers and coal fired utility boilers experiencing tube erosion, corrosion and slagging. This sprayed-on ceramic coating system allows for fast application rates reducing equipment down time. The composite ceramic coating is a high solids system that will withstand severe thermal cycling from ?300° F. (?185° C.) to 1600° F. (871° C.). This composite system is applied in two distinct colors to enable easy visual inspection of coating thickness.