I had 500 sq ft of reclaimed pine floors installed and sanded on my second floor (from 100 year old logs reclaimed from the Ottawa River) by another company hired by my contractor. They were done very poorly - clearly the company had no experience with pine and sanded improperly resulting in undulations or waves from end to end. They looked terrible. I tried to find someone to fix them but the other two companies I met with said, one, it was the result of the wood, or two, that it was my house's structure causing the undulations. Both of these seemed unreasonable as I have seen old growth pine installed elsewhere and they did not look like this.
I finally found Jeremy, someone who has experience installing reclaimed wood floors, including pine. He re-sanded and sealed the pine floor (using a low-VOC hardwax) and it is now perfect. We also had him install and finish 350 sq ft reclaimed birch flooring on the another floor, as well as sand our kitchen maple floors (which had been stained red). These floors are also now perfect. Jeremy and his team was professional, on time, courteous, and very knowledgeable about ecological and non-toxic alternatives to conventional building and renovation products. I would work with them again in a heartbeat!