1. Component B is a catalyst, which is susceptible to moisture hydrolysis, so the lid should be tightly closed after use.

2. As soon as the A and B groups are mixed, the chemical reaction begins; the viscosity gradually rises and cannot be stopped immediately. In order to avoid waste, it should be used according to the dosage and used as soon as possible.

3. The mixing ratio of groups A and B is related to the speed of the chemical reaction and the performance of the mold. The more component B, the faster the reaction, the higher the strength and hardness of the product, but the toughness decreases. Therefore, weighing is required to be precise.

4. Before preparation, the component A should be stirred up and down evenly, and then weighed.

5. The pouring method is suitable for relief type, and the brushing method is suitable for making three-dimensional molds. Molds for casting relief should be made with a frame that is 4-6cm longer than the original length and width. The border should be flat and the inside should be smooth. Place the frame on a clean glass plate when pouring, and then place the original in the frame, leaving a gap of 2-3CM on each side