TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst is inorganic alkali or organic alkali, preferably sodium hydroxide, barium hydroxide, potassium hydroxide, calcium hydroxide or triethylamine.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The olefin-based silane is silicon containing compound with double bonds and two alkoxyl groups. The silicone compound has two silicone groups. The olefin-based silane is vinyl-dimethoxy-silane, vinyl-trimethoxy-silane, methyl vinyl dimethoxy silane, vinyl tris(2-methoxyethoxy)silane or ally triethoxysilane. The silicone compound is ethylphenylsilanediol, diphenylsilanediol, diethylsilanediol, diisopropylsilanediol or propylsilanetriol triacetate. The organic solvent A is methylbenzene, o-xylene, p-xylene, dichloromethane or trichloromethane. The sulfhydryl compound has two sulfhydryl groups. The olefin-based silane coupling agent has two olefin functional groups. The sulfhydryl compound is 1,2-dithioglycol, 1,3-dimercaptopropane, 4,4' thiobisbenzenethiol, 3,4-dimercaptotoluene, 1,3- benzenedimethanethiol or 2,2'-thiobis(ethanethiol). The organic solvent B is dimethylsulfoxide, N,N-dimethylformamide, tetrahydrofuran or ethanol. The olefin-based silane coupling agent is tetravinylsilane, tetraallylsilane, di(isopropoxy)vinylsilane, 2,4,6,8-tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane or octavinyl-T8-silsesquioxane. Preferred Method: In the step (1), the content of the: olefin-based silane is 25-50 parts by weight (pbw); silicone is 25-40 pbw, organic solvent A is 150-250 pbw; and catalyst is 2-4 pbw. In step (3), the content of: the olefin-based silane oligomer precursor is 20-35 pbw; and the mercaptosilane oligomer precursor is 25-35 pbw. The step (2) comprises dissolving 40-60 pbw of sulfhydryl compound and 30-45 pbw of olefin-based silane coupling agent in 200-300 pbw of organic solvent B. The method further comprises curing the sealant at a temperature of 80-140 degrees C for 3-8 hours.