For the relatively large size and fine pattern of resin silicone tube crafts, we usually use the operation method of brush mold:
According to the complexity of the model, it is divided into sheet die and multilateral sheet die. For the brush die, the choice of die line is very important, one is to take the mold convenient; Second, the mold line should be selected in a position that does not affect the overall effect of the product, such as the animal model usually do not pass through the face and eyes and other obvious parts; Third, it does not affect product quality, such as the position of the mold line of the water feature series products is too high, the material is much when the mold line is sealed, and the product is easy to crack; The fourth is to reduce the operating procedures of the next process, such as opening half the mold.

Depending on the size and complexity of the resin craft, you can choose to pour or brush the mold.
The resin crafts that open the mold generally require that the size should not be too large, and the surface texture should not be too fine. The following is a brief introduction to the way of perfusion mold:
1. Fix the model first and make a mold groove with glass or plywood around it.
2. Clean the model, then wipe or air dry the model, silicone seal. Steps 1 and 2 can be adjusted according to the specific situation, with the aim of keeping the surface of the model clean.
3. Apply release agent or spacer to the model.
4. Select the specific type of silicone product according to the specific situation of the model, and mix the silicone and curing agent evenly according to the proportion.
5. Vacuum the stirred silica gel. Time 3-5 minutes No more than 10 minutes.
6. Pour the silica gel into the mold slot, wait for natural curing and simple modification after taking out the model, the mold is completed.

Several things need to pay attention to in the mold making process: First of all, the silicone seal ring is to choose the appropriate hardness of the silicone according to the model that needs to be copied, and pay attention to the proportion of curing agent; Secondly, the pre-processing of the products that need to be copied needs to be perfect, basically according to the different models to be polished, polished, cleaned, on the release agent and isolator and other all or part of the operating process; Finally, the operation process should be standardized according to the chemical principle of silica gel.

The following describes the brush process:
1. Carefully prepare the required tools and handle the model to be copied, the quality of the model is directly related to the quality of the mold.
2. Typeset according to the specific situation of the model, fix the model on the vacuum tank, the size of the vacuum tank is slightly larger than the model, and then fix it on the board.
3. Select the mold line, there may be several mold lines according to the specific situation, we now only take a simple fragment mold as an example. After selecting the mold line, it is best to draw it with a pen in order to be more accurate when operating.
4. Put the fixed model horizontally on another board. The wood or silicone products glued to the model must be perpendicular to the flat board. Fill the bottom with mud along the mold line and repair the mud with a mold repair tool. Make sure the clay is smooth, then close the mold button.
5. Clean the model and putty surface with dish soap, then air dry. Use a brush to apply the silicone mixture to the surface of the model. The first layer should be thin enough to cover the mud and the surface of the model. The model was then placed in a vacuum extractor for 7-8 seconds at -0.1Mpa. Brush the second layer after 30 minutes, and the thickness of the second layer is required to be 2-3mm. After the second layer, it is best to paste a layer of gauze after each brush to enhance the tensile strength of the mold.
6. After the softer mold is made, it is also necessary to use gypsum or fiberglass to make an external mold.
7. After the completion of step 5, repeat the previous process to make the other half of the mold.