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Geopolymer-based coatings exhibit good fire inhibition, temper resistance, and anticorrosion properties. In this study, coal fly ash-based geopolymers were investigated as coating materials. Two variables, namely, Na/Al and water/solid ratios, were used to study the effect of the chemical composition of geopolymer on adhesion strength, setting time, microstructure, and thermal stability (up to 800 °C). Maximum adhesion strength (3.8 MPa) was achieved using Na/Al and water/solid ratios of 1.0 and 0.33, respectively. The coatings attained their maximum strength in 3 days at 60 °C, and additional curing time up to 6 months did not affect adhesion strength. No direct or indirect relationship was found between setting time and adhesion strength. The amount of water notably altered adhesion strength, setting time, and microstructure of the polymers. Microstructural investigations revealed formation of mesoporous …