Kaolin, widely used aluminosilicate source material was added with alkaline activator solution, creating geopolymer coating paste.Optimum design for kaolin based coating using geopolymer technology was studied. The work was to analyses the effect of solid liquid ratio, sodium silicate and sodium chloride ratio and sodium chloride molarity on its adhesive performances on lumber wood substrate. Upon observation, coating with 0.9 solid/liquid ratio, 0.45 sodium silicate/sodium chloride ratio and sodium chloride solution with 6M molarity shows promising adhesive strength. These results were further evident with morphological studies.