Making a waterproof tactile switch is not difficult. Here is a simple method of making it:
Material Science:
Tact Switch 
Transparent silicone sealant
Conductive wire
Insulating tape
Battery (optional)
Steps:
1、Preparation work: Ensure that all materials are complete and maintain cleanliness during operation.
2、Prepare for the tactile switch and wires: Wrap the two ends of the tactile switch with insulating tape to prevent adhesion with silicone. Ensure that both ends of the wire are connected to the two poles of the tactile switch.
3、Sealed touch switch: Apply transparent silicone sealant around the touch switch to ensure complete coverage. When applying silicone, make sure not to let it enter the interior of the switch to avoid affecting its normal function.

Silicone drying: According to the instructions of the silicone sealant, wait for it to completely dry. This usually takes several hours to a day.
Test: Ensure that the tactile switch still works properly after sealing. The function of the switch can be tested by connecting the battery and wires.
Completion: Once it is confirmed that the tactile switch is working properly and sealed properly, it can be installed in equipment or places that require waterproofing.
Through the above steps, you can create a simple waterproof touch switch to meet specific needs. Remember to pay attention to safety during operation and ensure that electrical equipment is in a power-off state.