Setup & Application Prep:Before applying the All Hours Glow Foundation, ensure your skin is clean and well-hydrated. Applying a suitable primer can further enhance the foundation's wear time and finish.* Skin Preparation: Cleanse and moisturize your face thoroughly. Allow moisturizer to absorb fully before applying primer or foundation.* Primer: For extended wear and a smoother base, use a primer that complements a luminous finish.Compatibility:* Skin Types: Info needed: While generally suitable for many, those with extremely oily or dry skin may benefit from specific primers or setting powders to optimize performance.* Other Products: Compatible with most liquid, cream, and powder makeup products. For best results, use with other YSL beauty products.Care & Storage:* Storage: Store the foundation in a cool, dry place away from direct sunlight and extreme temperatures.* Hygiene: To maintain product integrity and prevent bacterial growth, avoid direct contact of your fingers with the product in the bottle. Use clean applicators (brushes, sponges) and wash them regularly.* Shelf Life: Refer to the 'PAO' (Period After Opening) symbol, typically a jar icon with a number followed by 'M' (e.g., `12M`), on the product packaging for its recommended shelf life after opening.