About 8 years ago we installed pine wainscoat in our kitchen and hallway and used wood filler to cover nail holes. We used a clear varnish. Now that the wood has aged and darkened, the putty marks are very visible (they didn't darken) and look terrible. I thought if I stained the wood a darker color (natural cherry)that the putty marks would stain and blend in...wrong! Is there any way to cover the marks other than painting everything? Any advice will be appreciated!