1, curing agent and accelerator are of poor quality and contain moisture.

2. In the process of making resin handicrafts, a large number of materials with strong water absorption are used, which makes the resin easily absorb the water in the air and filler.

3. The humidity of the air is high, which causes the humid air to enter the mold cavity during the resin curing process, thus inhibiting the polymerization of the resin on the surface of the product.