The gutter joint on the original cab has completely blown apart with rust and would be almost impossible to repair which was the main reason for getting the new cab. After blasting I gave the gutter a couple of thick coats of the urethane anti-rust primer before spraying with epoxy. I can report that resealing the black primer can with a layer of food wrap worked well; there was no sign of the paint setting and the lid came off easily.
I discovered that for a large area like this, my standard 1.4mm gravity gun really struggled to get enough paint on evenly. The epoxy primer is quite thick and whereas it was fine spraying a narrow pattern as soon as I opened the fan up hardly any paint came out so the end result although acceptable is a bit rough and uneven. The data sheet for the primer recommends airless spray, brush or roller above conventional spraying and this is why I guess. Next time I have some mixed up I will try thinning a little more and add another coat to see how it goes. I intend to spray the whole thing with a high build primer when I come to painting anyway; this layer is really just to seal the surface.
