I've been doing this for a while. Mix 1 pump of Acne.org Moisturizer, an equal part of Acne.org AHA+, and about a penny-sized amount (when in doubt use more) of Neutrogena Clear Face Liquid Lotion Sunscreen Broad Spectrum SPF 30. Optionally, add 56 drops of jojoba oil.

For some reason mixing Acne.org Moisturizer and AHA+ thins the consistency. It becomes just a bit thicker than milk. This texture allows for easy application and for quick absorption. The sunscreen helps protect your skin against skin sensitivity which is due to the AHA, but even without AHA you should still use sunscreen. Also, because this is a chemical sunscreen, it absorbs completely without having to rub the it into your skin. My skin looks & feels awesome after using it.

The thing that makes it different from regular lotions is that it has such a light, runnytexture.