nothing that i know of will harden pine.but theres something else you should be concerned with more,warpage and swelling /contracting. nearly all the real old pine flooring ive seen( old as in a hundred years old ) was not nailed tightly , and had oakum joints between boards. remember to get your boards inside your area for as long as possible,to let them aclimate properly before you nail them down! they will swell and shrink a surprising amount depending on moisture content.the oakum lets them move without warping similar to planking on a boat, and it makes for an interesting floor,that i kind of like myself. flooring is most often narrow boards to help keep cupping to a minimum, but with boards that wide they have to be able to move.back a hundred years ago when we used 1x8 pine as subflooring,we would leave a min of 1/4" gap between boards.of course you dont want these gaps in your finished floor,so most folks ship lap them .the oakum in the gaps lets it move without warping but you can still sweep and things.saw one old house on tv where they unbraided old hemp rope and used it.
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