Please do not use pre numb. Pre numb creams will have to stay on your skin for at least 30 mins. Skin does absorb the liquid in the numbing as it goes into your skin. This will make the skin soggy, filled with water. So when I put the ink in, it dilutes the ink, making the tattoo heal faded and not as crisp.
If you have a long session, the tattoo is lined and skin is opened, I do offer spray numbing that goes in instantly, this will help the next part which is shading.