As you use your vaporizer, you will slowly begin to notice decreased vapor production and less intense flavor. After a week or two, you will start experiencing a burnt taste, indicating that it is time to change your atomizer coil.
While many simply fill the tank, screw on the new coil, and begin vaping, it is highly recommended that you first prime your new coil prior to using it. Doing so will substantially add to the flavor of the e-juice, as well as help optimize your vaping experience.
In short, priming an atomizer coil simply means to pre-saturate the wicking material with e-liquid prior to first using it. This moisture will prevent the wicking material from overheating and burning. It also allows the wick to more fluidly and uniformly absorb the e-liquid from the tank and deliver it to the coil.