Yeah, unfortunately you can't 2K over Penetrol, so it's all a bit of a compromise. From what I've read Penetrol is about as good on bare metal as anything, so I'm hoping that'll do the heavy lifting, and the satin is for the finished effect and some protection. Given the timber and everything else on the bike, I think it's really only a fair-weather rider anyway, and it'll mostly be stored under cover. So the theory is marine varnish should hold up pretty well under those circumstances. Theory is all well and good though... we'll just have to see how it performs. If it's no good, I guess I'm pulling the bike apart again...