Coverage varies by product: some green correctors are sheer or light (priming or subtle neutralizing), others are buildable, and a few are formulated as full-coverage concealers. Check the product description to confirm whether it’s marketed as a primer, a treatment, or a concealer.
Green correctors are used to neutralize redness. Apply a thin layer where needed, blend, then either set and leave alone for light coverage or layer foundation/concealer over it. Some formulas also serve as primers—apply before foundation—while others are designed to be used alone as a spot treatment.
Wear time varies by formula and how it’s applied. Many listings and reviews describe these products as long‑lasting; one review specifically noted color correction lasting over eight hours when the product was set. For best longevity, follow application instructions and set with powder or setting spray as recommended.