Where can I learn foam sponge?

Sponge foaming can be learned from the internet. There are tutorials online.

1. Sponge sand bubbles are formed by prepolymerization, mainly by making a model first, then adding water, catalyst and surfactant into the model, then mixing and foaming under high-speed stirring, and curing at constant temperature for a period of time.

2, semi-prepolymer method, this process is mainly to make a model first, then add another part of white material, black material, water catalyst and other substances, and mix and foam at high speed to use.

3. One-step foaming process. This process is mainly to add white and black materials, water and catalyst, and then mix them at high speed, but inject them into the mold where I need to fill the foam.