Gluing, first molding the product, and then filling the product. The composition of the glue is mainly composed of an adhesive colloid and an organic solution. The role of the adhesive colloid is to act as an adhesion. The organic solvent refers to a low-toxic, volatile chemical solvent capable of melting the adhesive colloid, such as cyclohexanone, gasoline, acetone, methyl ethyl ketone and the like. In the glue filling, the volatilization of the organic solution is mainly used to make the sponge reach the expansion effect. Therefore, when filling the glue, try not to expose the sponge with the glue to the outside, so that the expansion effect of the organic solution on the sponge will be reduced.