I have 227 year old, probably white pine floors throughout my house. I just sanded and will be using Zar's Classic oil based polyurethane. I am wondering if I should use a sealer prior to the poly. Any thoughts?
Poly is a sealer. Are you asking about stain first?
No sealer is required. If the Zar is true oil based finish you can always cut the Zar with paint thinner and create a sealer. Not an issue, I do it all the time, especially when i am doing touchups. I would no go with high gloss, it will shown all marks. Use semi gloss instead