I decided to prime the rudder at the same time as the transom frame, saving time later on and materials now.
Here is the rudder with white primer applied and taped off to apply grey to the cheeks.
Then the cheeks got three coats of grey primer, like this.
Lastly I marked up and taped the blue boot top to match the hull, sanded it and applied grey primer. It was starting to look quite smart!
I can't wait to gloss it all!