My house was built in 1903 and the woodwork on the first floor and the main areas of the second floor is beautiful oak. The kitchen, however, is soft beat up wood (I think pine). At some point someone stripped the woodwork in the kitchen and was a bit overzealous in the process and the wood was really chewed up. So, while generally opposed to painting woodwork, I have filled in the worst areas with wood putty and am painting it white (probably what it was in the first place). However, the wood keeps bleeding through the paint. I have primed the wood with Kilz and it even bleeds through this. In some areas I primed with Kilz, then painted with paint with primer in it and then Kilz again. So far so good with that, but why is the wood bleeding through the paint? It doesn't appear to be stained, but I guess I could be wrong. Any suggestions?