The Rickenbacker Bass now has 8 or 9 coats (I lost count) of tung oil, linseed oil and poly blend. 1 part of each with a little bit extra of the linseed oil to thin it out. Worked like a charm. Nice film build up but still very thin. After each coat I waited 24 hours before applying the next one with a very light sanding with 1200 grit sand paper.
Take a look at the neck, nice and smooth.