I have dry skin and I put moisturizer on, and then foundation and concealer. But, with the heat and everything, my makeup is sweating off. So, I bought MAC Primer. I've never used a primer before this. I did what the saleslady told me: Moisturizer, then primer, then foundation, etc. The primer REALLY dried out my skin and I couldn't even put on foundation because my skin was so dry. I don't know what to do now. Should I use another moisturizer? Can I put primer on first and then moisturizer, or will that just ruin the effect of primer? I'm using Ponds Moisturizer right now.