painting adark varnished door with white gloss?

First sand off varnish to give the primer a good key or the finished surface will chip easy. Any good quality primer x 2 coats,may be three being a dark colour Undercoat x 2 coats and top coat to finish. Check when undercoats have dried there is no dark colour 'bleed through' Ghost dark colour, if so apply a further undercoat until 'Ghosting' disappears.

Bob
May 2009