First check whether the surface of the product model is smooth. If the product model is not smooth, the surface of the product that is poured out after making the mold will also be not smooth.
Second, if the product is not smooth, see if the resin-curing agent is sufficient. If the resin and curing agent are insufficient, the product is not completely cured, which will cause the product surface to be sticky.
Third, if the curing agent and the silicone rubber are not stirred evenly, the mold will appear and cured, while not cured.