I have never turned spruce but a few years ago got ahold of some beautiful
but horribly sticky pine. Afer some experimentation, what worked for me
was:
rough turn
seal the end grain and bag for several months
finish turn
wipe down with solvent (don't recall what I used)
sand
wipe down with solvent again
seal with shellac
apply whatever final finish you prefer

Best of luck. If it's not unusully pretty wood, it's not worth it.

Mike Paulson, Fort Collins, CO