Thanks for the replies guys, I was toying with the idea of base painting the tracks of the kit and then fitting them but I really don't think that going to be an option.  

Looks like I'll have to fix them in place and then prime and keep my fingers crossed.

Cheers

Guy showed me a trick- pick up a can of bumper spray paint from the auto parts store. It's made for rubber and rubber-like plastic and can be applied as a primer under any other coats you want to spray.

I've never had success painting rubber band tracks with acrylics. The paint just doesn't seem to want to stick to it and flakes off.