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

2. Once group A and B are mixed, they will undergo chemical reaction; Starting immediately, the viscosity increases gradually and cannot be stopped. In order to avoid waste, it should be prepared with use according to the dosage. It should be used immediately after preparation without delay.  

3. The mix proportion of group A and B is related to the speed of chemical reaction and the performance of die. The more component B, the faster the reaction, the higher the streng  th and hardness of the product, but the toughness decreases. Therefore, accurate weighing is required.

4. Before preparation, mix component a up and down evenly, and then weigh.

5. The pouring method is suitable for relief, and the brushing method is suitable for the manufacture of three-dimensional molds. For casting relief molds, a frame with a length and width of 4-6cm larger than the original length and width shall be made first. The border should be flat and the inner surface should be smooth. When pouring, place the frame on the clean glass plate, and then place the original in the frame, leaving a gap of 2-3cm on each side.