sanding baltic pine floor boards

we are in the end stages of painting our walls and the next job on the
list is sanding and polishing the old floor boards that were under the carpet.

The flooring looks like baltic pine i got some quotes but i am thinking of hiring the sander from kenards and doing it my self

any tips on using drum sanders and not getting it to looking wavy
besides sanding at 45 to the boards

ive got to replace a couple of boards but cant find baltic pine one guy told me to get radiata pine and stain it to match. would it look good if so what would be the best stain to use

ive also been recomended to use ESTAPOL two pack polyurethane
is it worth the extra money if not what better water or oil based


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