It's effective when it comes to hiding imperfections. It is indeed very opaque. I use a damp Beauty Blender to blend it into my skin when I apply the stick. I use the shades 15 and 35 on my dark circles as well, but since it's a larger area, it tends to be so caky... I try to apply some setting powder on top to solve the problem but I know a corrector stick is not supposed to turn out with that bad of a texture... Maybe that's what you get if you want it to be a 100% opaque.

I recently decided to try the Vichy Dermablend Corrector Stick and have been quite satisfied with this product. The stick conceals dark spots and blemishes very nicely and lasts all day long!