Thanks, gents. 
Splinter - I'll test some samples when I get to the finishing stage.  If I want to keep the background white, I think I'll need to stick to a waterborne finish.  I has some General Finishes poly on-hand, so it's likely to be that.

Robinhood - I appreciate that, thanks.  I can definitely say that I'm slow.  😁  Not always calm, though.