I own a barn (actually a pig sty!) conversion the beams of which are in a really bad state. They had suffered in the past from woodworm infestation, and are peppered in holes and track marks. They are currently stained light brown, but are in dire need of decoration. I don't think sanding is an option, so I'm left with painting of some sort. Originally, I didn't want to paint them black, but I think it is the only option. The trouble is filling the badly damaged surfaces. Is there a paint that will fill the surfaces? I don't care if the surface texture of the wood is lost, as I'm sure it's only a softwood (the timbers are 3"x6") and not oak.