In message , news.virgin.net
writes
Hi,
I fixed up some pending structural rust on my bike with hammerite red
undercoat but don't really feel the need to colour match the bit I did
(underneath). Can I just leave the undercoat exposed ? will this do the job
? I'm always seeing cars driving about will only undercoat.

Hammerite undercoat, I don't know, but I thought that normal undercoats
absorbed water

--
geoff