I removed the wall to wall carpet from the 70 year old house I recently
bought. The floors in the bedrooms appears to be pine coated with shellac
possibly polyurethane. I don't want to refinish the floors because of the
patina. In only isolated spots and by the door the coating show heavy wear.
How can I find out which coating is on the floors? How can I protect and
preserve the floors? What should I use to clean and preserve them?
You're on the right track with alcohol on a rag in an inconspicuous
location. Probably shellac being the age it is. Shellac and lacquer
are the only finishes I know of that melt the previous coats making a
single coatd of finish on the substrate. Polyurethane, a varnish,
doesn't melt previous and requires scuff sanding between coats to get
Waterbased can be used as the finish is fully cured. It doesn't smell
like oil based does and doesn't have the ambering effect like oil.
Scuff sand with 150 grit and wipe up the dust with a rag dampened with
water. Don't use paint thinner/mineral spirits around anything that
will be topcoated with waterbased finish!
No, you can apply water over oil. Whether it is oil or water you are covering
over you will need to lightly sand. I doubt a 70 yr old floor is poly though.
Poly wasn't invented until the mid 50's. What did you find with the alcohol
The house went through a major renovations during the 70s and 80s.
It appears the floors have been refinished (power sanded) at once.
Haven't tried the alcoholl yet. Going to test this weekend.
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