It locates multiple leaks and those not found by any other method. Its lack of disadvantages explains why it is the most popular leak detection technique.
Some people lay newspaper down to try to locate the general area of the leak.
They will check the color of the fluid to try to identify what system it is coming from, i.e., red for transmission fluid, green for coolant, etc. However, it s often difficult to pinpoint the exact source. Cannot be used for refrigerant leaks or for small leaks which evaporate right away. It s difficult to detect for clear liquids. Although it s inexpensive, this method has a number of serious drawbacks.