COLLECTION Lasting Perfection Ultimate Wear Concealer, Cool Medium. , COLLECTION's Lasting Perfection Concealer is a multiple award-winning concealer. COLLECTION's Lasting Perfection Concealer is a multiple award-winning concealer, known for concealing blemishes and imperfections for up to 16 hours. The formula is water-resistant, transfer-proof and easy to blend. It can create a flawless base either used alone or with foundation. For best results, use with our Lasting Perfection Weightless Foundation.