What lubricant for window and latch parts?

[35 Ford]

I cleaned up the window regulator and door latch today. What lubricant should I use on the latch and the regulator? A spray silicone or a grease? None?

I plan on painting the parts as well. The regulator had paint on it before but the latch did not appear to have paint. I assume its ok to paint these parts?

Thanks!