These pictures show my first experience with Stewart Systems Ekofill. This does a bit of double duty as a type of primer and also protects the fiberglass from the sun.
The first picture is of the left rear of the fuselage and the rear opening. The grey color is nice, but there's a bit of texture to the paint (orange peel) that you may not be able to see.
The second picture is more of the Ekofill, but just aft of the fuselage.
The third picture is another example fo the Ekofill, but looking at the cockpit area from the front.
