OK to thin primer when using paint sprayer?
Today I began trying to prime the exterior of my house with Kilz water based primer/sealer using a Wagner PowerPainter Pro sprayer. For the first 15 minutes it worked great, but then the performance went downhill fast. The spray tip began to clog up and after about 1/2 hour I had to stop. The troubleshooting tips for the sprayer say that the symptoms I saw were the result of the paint being too thick. Does anybody have any idea whether it is ok to thin Kilz primer with some water? If so, how much?