"JoeJoe" wrote in message
...
What is the difference between a primer and an undercoat?

Traditional painting uses a three coat system: primer, to prepare an
unpainted surface to receive paint; undercoat, to build up the colour; and
top coat, to provide protection to the whole. Modern paints tend to be one
coat paints, which achieve colour build and protection in the same paint.

If you want the paint job to last, buy Dulux.

Colin Bignell