Many liquid glow formulas are designed to layer with makeup. They can be worn under makeup as a primer, mixed into foundation, or applied over makeup in some forms. Several products and reviews note they perform well without pilling or leaving a white cast.
Yes—some glow formulations include sunscreen. For example, one dewy moisturizer in this set is formulated as a sunscreen moisturizer with broad-spectrum SPF 50, offering protection while leaving a radiant finish.