I thought I'd found the perfect combination of primer and foundation for my combination/ oily (prone to spots and redness and with large pores) skin. I've been using Loreal Infallible Primer and Revlon Colorstay foundation, and whilst after 14 hours it doesn't look perfect, it certainly is still on my face. I don't generally use moisturiser but have started to as I'm only getting older- but whatever moisturiser I use, even Garnier's apparently oil free, mattifying Moisture Match one, even taking care to leave it to settle for some time before applying primer and then making sure the primer is set before I apply founation, within a few hours my foundation has just disappeared. What am I doing wrong?!