Adrian wrote:
Chris Bartram gurgled happily, sounding
much like they were saying:

Primer isn't waterproofed - so if you don't get it covered over, water
will get into it and you'll end up having to sand it back and start
again.

Probably be ok if you warm it to dry it thoroughly. After all, you
wet-flat primer...It's a big problem with metal underneath though, as it
rusts.

Pffft.

The new screen surround and rear valance put on the Acad last spring have
been absolutely fine left in primer through the winter.

Which reminds me - I must order some of Screwfix's finest fiver-per-litre
red lead oxide, and some more cheap brushes.
I reckon red oxide is less affected- it's just what I've been told
mostly, though I did get badly caught out with grey primer on a very
damp day repainting the door of my Golf (telephone pole outside my
drive, all my own fault) and trapped a load of moisture under the
topcoat. It rusted a few weeks later, staining the white paint.