I wanted to Illustrate the process .
Firstly the door needed to be sanded off to get rid of the flaking varnish on the outside. I then wiped over with turpentine.
The inside was painted, so it needed to be sanded to allow the undercoat to adhere to it well. Again after sanding it was wiped over with turpentine followed by a coat of undercoat.
Outside of doors Primed & Undercoated
Applying Gloss with Brush
The final coats will be Gloss Paint it will need at least two coats to cover the undercoat.