Dave wrote:

The Natural Philosopher wrote:
... snipped


Depends. I use filler primer a LOT on stuff that has to have an
immaculate finish. It is often the best place to fill grain.

Undercoat is only there for colour.


Filler primer sounds useful but I don't recall seeing it - is it a
specialist thing or have I just not recognised it in the sheds?

Dave
halfords. Car body stuff..
But acrylic primer fills well and can be rubbed down too.