I'm choosing b/w several floor sanding companies. The most reputable one in the area actually provided the lowest quote. When I pressed for the differences, I learned that others insist that top-nailed floor nails need to be individually puttied and that takes all day. The lowest-quote guy insists that with modern machinery the puttying step is unnecessary.
They all supposedly use this super-duper German machines branded Hummel.
Who's telling me the truth?
Thank you very much!