Underseal on sills?

[BristolSam16v]

Just sanded down and applied some back2metal rust stuff on one of the sills near the rear as it looks like it was cut and rewelded at some point and there was a lot of surface rust.

Now its only the last half metre or so and the rest of the sill looks like its got underseal on it then paint over that?

So Im thinking of putting the underseal straight on the bare metal then spraying that, then lacquer? Or should I primer the bare metal with some anti-rust primer before I underseal it, then spray+lacquer?

[Andy P]

Ive done a similar sort of thing last week mate. This is the effect i got by using stonecheap sealer.

http://www.williamsclio.co.uk/forum/...ic.php?t=29544

I used this stuff.

http://solutions.3m.co.uk/wps/portal...beCF1Z1J1R51gl