Ross; i know that you do a lot of home improvement/restorations. here's my problem. I live in a circa 1750 log house that still has the original floors. some areas have a lot of wear on the floors, to the point that the groove has worn so thin that the top portion of the grooves are breaking off. i want to fill these areas but the problem is that since the boards are random width, 5 to 12" wide they have a lot of movement with the season changes. standard fillers won't stay put since they are ridgid and then crack away. do you know of any crack fillers that have a lot of flexability that might stay in place. BTW replacing the boards or putting down new floors isn't an option.Thanks in the hope that you may know of a material that might work.S/V Que Pasa?