Detailed answer

Sunscreen is typically not formulated for use on the lips. It is designed to be used on the skin to protect it from harmful UV rays, but lip products require their own specific formulas. There are specially formulated lip balms with SPF that are designed to provide sun protection to the delicate lip area. Using sunscreen on lip primer stick pot tube may not provide adequate protection and may not feel comfortable or perform well on the lips. It is important to choose products that are specifically made for the lips to ensure proper protection and care.