If drinking water-based Kilz primer was made use of it didn't seal the floor, so any time you used the paint it lifted the wood grain. That's probably why it feels tough. Oil primer, or white shellac primer (BIN), seals the area for paint and it won't raise the grain. http://cabinetpastorelli26678.fitnell.com/26758917/the-definitive-guide-to-painting-kitchen-cabinets-ideas