Thread: sealing plywood

If it is a floor I would go with boiled linseed thinned with a little turps on the first coat and neat on the second. This will give a hardened finish that dirt wont stick to because of the oil surface structure, even though it is dry. If you go with Poly, it will be a soft floor (because the poly sits on top and doesn't penetrate) that will mark-up and scratch with fine dirt on the floor and dirt / dust will cling to the abraded surface. My office, my gear room and store room all have oiled floors.