Thermal conductive silicone grease is in the state of silicone grease before use, and it is also in the state of paste and grease when it is applied to the substrate, so you can proceed to the next step without waiting. Thermal conductive silicone grease only has good thermal conductivity when it is in a paste state, once it dries and even cracks, air will enter the cracks and as air is a non-conductive material, it will affect the thermal conductivity of the silicone grease.Therefore it will affect the thermal conductivity of the thermal conductive silicone grease and reduce it.