Sanding and dust
Make sure your wear good dust masks and not just the paper kind. After your final sanding, wet wipe the ceilings, walls and floors to get all the dust up before applying the poly.
I used a water based poly and there was no smell, and could apply the second coat in just a few hours. Light sand again when dry and apply third coat. This water based poly cost a little more but the lack of odor throught the rest of the house was worth it. clean up is easier also.
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