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We just installed a very expensive hardwood floor (alomediam Brazilian wood-dark wood) and after two coats of varnish, I can see shoe scarf marks. What is the strongest varnish or finish that can used of this type of wood so as to prevent any scratch marks?

I am in the process of renovating my house. One of the improvements is the addition of pre finished “Aztec Cherry” floors. I had a few people helping the day that we started the floors. The guy that had experience installing hardwoods was working on the 1st room while I was working on something else. This room is roughly 10′ by 15′. My concern is that, he didn’t leave a gap on the wall that the first strip of wood went down on. For the two walls that the wood runs perpendicular to, some of the pieces were cut to leave 1/4″ for expansion, but some run right up to the wall. On the wall where the last strip was installed a 1/4″ gap was left. I am wondering if you think that this will cause problems in the future? Is there anything that I can do to correct this problem? Also, should an expansion joint be left in all of the doorways? I would prefer to have all of the wood seamless, but want to install it correctly.

Is it safe to place small rugs, i.e., runner with a non skid type backing on newly refinished hardwood floor?

How do I sand/refinish the v-groove? I’ve seen many articles on finishing floors but none seem to address the v-groove.