Fixing rust patches in the roof gutter - Part 1

So, as perfect as my lovely Figaro is there was a couple of patches of rust in the roof gutter area.

Here is what I was faced with, dirt, leaves, gunk and patches of surface rust.

Also a nasty patch of rust bubbling under the paint that threatened to get worse in this often wet area of the car.

I pulled back the seal and cleaned up all the muck, this took ages as it was pretty well bonded into the rubber after years of being ignored. I sanded the paint back as much as I could with wire wool and sand paper, I coated the sanded back rusty area with Kurust formula and then sprayed it with Zinc based primer, being VERY careful to mask off the roof and cover everything I didn't want paint on.  Here is the result:

(oops didn't mask the white rubber seal, got a few spatters on there, guess I will fix with white trainer dye)

Next phase is to paint with a close matching white colour, stick the roof seal back down with bostick glue and finally fill in any gaps between the seal and bodywork with a silicon based sealant. Then hopefully we should be good. I will post the final result in part 2 of this post.