First, keep in mind that if you are using a stronger peel or if you have sensitive skin the contact times can be adjusted based off your particular circumstances. The benefits of applying a peel in layers can certainly be enhanced as multiple layers can increase the penetration of the peel and depth. Do not attempt to apply a peel in layers if you have never used the peel before. Layering is for those who have experience using peels and for those who may have become more tolerant of the peel.
Step 1: First apply the peel as normal following the instructions. Allow the peel to penetrate the skin for 1 minute.
Step 2: After 1 minute (do not wash off the peel at this stage), apply a second layer to the same exact area in which you applied the first layer and allow it to work on the skin for an additional 1-2 minutes. Note: if you decide to apply a third layer, only leave the second layer on for 1 minute instead of 2 minutes.
Step 3: For most people, a second layer is enough. However, if you decide to apply a third or fourth layer, use the same method of 1 minute intervals. Make sure not to leave the peel on longer than the total recommended time.
Step 4: Always make sure to neutralize the peel with water and remove all traces of the peel.
Note: Some peels may not feel like it is burning that bad such as the lactic peel, until you actually start removing it with water. Then you can begin to tell it was penetrating the skin the entire time. With this is mind, do not leave the peel on for longer periods of time because it does not feel as if it is burning that bad.
However. During any part of the process if you do feel like the peel is burning beyond what you are comfortable with, quickly neutralize the skin by removing it with cool water. Keep in mind layering is more risky and it is easier to burn your skin, so be very cautious when using it in multiple layers. It is recommended you keep a close monitor of your skin throughout the entire peel process.