Prep eyes and intensify your eyeshadow with Lid Lock Eyeshadow Primer. The ultimate solution for smooth, crease proof eye makeup that stays looking fresh all day and night. For best results, apply to bare lids before eye makeup application and blend with fingertips. Benefits. 100% Cruelty Free & Vegan. The ultimate solution for smooth, crease-proof eye makeup that stays looking fresh all day and night. Preparation is key. Designed to prep your eyes lids for eyeshadow application. Helps prevent creases. Long-lasting formula. Product is non-returnable for hygiene reasons.