Okay, so I know the walls are 11 years old, but beyond that, I don't know if you are talking about the inside or outside of the home, or what material it is that you are trying to paint. If it happens to be the paneling I had in one mobile home I lived in, you can't just paint it. This job involves sanding the paneling finish to rough it up, primering the surface, then painting. Don't try to fill in the grooves, they aren't deep enough to hold the mud, and the results aren't worth the effort.
If I am totally wrong about the application, you need to give me more information. Have fun!