I love the look of a nice bright walkway (especially in the summer). The walkway is concrete and I decided to paint it white, it looks fantastic; however, it doesn't last all through the summer without begining to peel in certain areas. I have made sure to use paint for porches/patios. Should I be using a special primer prior to painting the concrete or should I use a different type of paint? Please advise (and hopefully you wont suggest I give up the paint job):-)