This complaint is commonly referred to as a "leaking" sink. Water droplet found under the sink is due to condensation. It happens when the air temperature inside the kitchen cabinet is warmer than the air outside. The greater the temperature difference, the risk of condensation is higher. So, please do NOT defrost your frozen food on your sink. A classic example is to take out a can drink from the fridge and leave it on the table for 10 minutes. Your table will be wet due to condensation from the can drink.