I found a large natural bristle brush worked well.
Shellac pine floor.
Shellac is the best floor finish for an old house shellac link i use this on all my floors http amzn to 2emnp3u.
This knowledge is equal parts gross and fascinating to me.
As far as i know amber shellac has been and always will be the classic retro finish for knotty pine.
Made from flakes of resin secreted by lacs insects native to asia and dissolved in alcohol shellac is typically available in clear or amber but can also be tinted to bring out a range of hues.
I used a 1 pound cut sealing coat of shellac on my pine floors before i waxed them.
Polyurethane and epoxy products gel stains oil based or latex paints and clear topcoats such as varnish or shellac are the best finishing products for pine wood.
It dries very fast so 2 3 coats can be applied in one day and is ready ot walk on in 2 3 hours.
Without shellac pine s pitch can bleed into oil based finishes leaving fissures or shiny spots that remain tacky especially around knots.
This article has outlined step by step finishing instructions for various pine wood projects including outdoor furniture floors and wall panels.
Seal the surface with two coats of 2 lb cut dewaxed shellac.
However shellac is about as natural as it gets for a wood flooring finish.
It comes from the resin secreted by a lac bug found in india and thailand.
The resin is scraped from trees and then diluted or processed in denatured alcohol when used for flooring purposes.
Our grandpas and dads were putting this orange honey gold finish on their unfinished knotty pine back in the 1950 and 1960s and the product is still available today as bulls eye shellac by zinsser which is a rust oleum company.
Thinner cuts of shellac leave less brush marks.
For you purposes at least 5 6 coats of shellac can be brushed or rolled on to a well sanded pine floor.
I believe it was a badger hair brush.