Hot Rods rust preventing coating or paint

Stripping and repainting door latches on Woodie, I'll paint the face side to closely match the original color but want coating for the inside that will prevent the reappearance of surface rust. I'd prefer something clear but maybe galvanizing spray or ?? I don't want a heavy coating as there are springs in the mechanisms. Any suggestions

 

Used this in the past works well goes on like regular primer then just paint over top

 

Gibbs?

 

POR-15

 

XIM 400 sealer/bonder is available in clear, works on ferrous and non ferrous metals.

You can retain the unpainted look. HRP

 

LPS3

 

grease