For a majority of sunscreen products to be effective, it is very important for the product to penetrate the epidermis and form a protective layer for the most UVA and UVB light frequencies.
The outer layers of the epidermis are in various stages of death and are flaking off at a fairly consistent but somewhat uneven pace. Thus it is important to be sure that the product penetrates below the dead layers. This usually requires about 10-15 minutes.
The ideal facial sunscreen should have a good quality moisturizer that is designed for the needs of facial skin. This is a bit hard to find. Adding to the complexity, it is also very important no tho use products with ingredients that are harmful yet still sold in the US. Most European countries have banned these sunscreen ingredients because of the potential for harm to all mammals:
PABA and PABA esters (ethyl dihydroxy propyl PAB, glyceryl PABA, p-aminobenzoic acid, padimate-O or octyl dimethyl PABA)
Thus it will take some detective work to find acceptable products. I think this product: http://www.juicebeauty.com/store... has found a great balance for all the issues (I have no financial interest in the products or company).
In any case, let the sunscreen set first for about 10-15 minutes than apply makeup. The challenge is the need to reapply. In the best of worlds this would be a start of the process to the beginning for maximum protection.
Emily Altman, MD, Board certified dermatologist in NJ specializing in cosmetic dermatology, cosmetic laser surgery, general dermatology and dermatologi...(more)MD, Board certified dermatologist in NJ specializing in cosmetic dermatology, cosmetic laser surgery, general dermatology and dermatologic surgery. http://www.advancedskinwisdom.com
Sunscreen should go directly onto the skin, so apply it under makeu...