I picked up 2 different shades of MAC's Pro Longwear Concealer in NC35 and NW25. I've tried both shades as an undereye concealer after I put on my foundation. It has a very opaque coverage but not thick. I hate that its a pump. You can't really control how much comes out. One pump is just way too much. Half a pump is still a lot but enough. I apply it with a flat small paddle foundation brush. Specifically the Sonia Kashuk one. I dont recommend using your fingers because I've tried spreading it on my skin and then dabbing it into place but it just lifts the concealer back up and I have wierd looking patches so a brush for me is quite ideal. It dries very fast so the less you put on the better it looks. The more you do it just looks cakey. I definitely reccomend this for Professional and everyday use for a flawless look.