Can you add turpentine to less dense pine to make it more preservable and paintable?

Answer 1

1st coat - 400ml of Turps to 1 L of Linseed oil
2nd coat - 250ml of Turps to 1 L of Linseed oil
Kero can be substituted for Turps
Terebene can be added at 1 part in 50 to speed up the drying times.

This a home-made decking oil I use on unfinished timber furniture every couple of years