I sealed the last of my masonite panels today - I prepped eighteen in total. Half are quite small at ~6x8 or so, while the rest are assorted larger sizes. The first coat of gesso is on, and drying, so I should be able to do a second coat this evening. The good thing about preparing a large batch of panels is that by the time I finished applying a thin coat of gesso to the eighteenth panel, the first panel was nearly dry.
I have three new jars of Art Spectrum Colourfix Primer to try out - I ended up buying Rose Grey, Soft Umber and Raw Sienna. The Raw Sienna is especially beautiful!