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Polyurethane application method for uneven and not uniform floors 

I am looking for advice on application tool of oil-base poly on reclaimed pine floors. The floors are old pine boards dating back to late 1800’s. The planks have been removed, squared,  planed and reinstalled. The challenge I am facing is that the boards are not the same thickness, so the surface is not perfectly level. Additionally some of the edges are rounded off creating a grove between boards. All those inconsistencies are great for character, but make the application of poly much more difficult. I am hoping to avoid having poly accumulating in the grooves and possibly seeping into the small gaps between boards leading to different drying times. I ran into that on a smaller project in one of the bedrooms I already finished. In that instance I used a wood block with lambs wool to apply the poly. I found small pockets of poly were squeezed out from the spaced between boards some time later (as the wood expanded). I suspect that the problem could be avoided if the application was more uniform in both surface and gaps, something that  is very hard to achieve with the plow method.

Do you think that a roller application could be a possible solution to my challenge. Or maybe you know of another solution I could not think of myself. Any advice is much appreciated.

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