Argh. I tried to do the same thing today, only instead of my covergirl concealer, I used revlon's colorstay concealer because it has salacylic acid in it. It looked kinda awful. I ended up having to wipe it off and I didn't have time to fix it because I had to get to work.

I think the problem might be that the concealer was in light, and I'm more then likely way too fair for it, seeing how I actually use the lightest color in the colorstay foundation. I'll try it again tomorrow going back to the covergirl.