A bit of a fail on the paint side of things...
Am working on painting the rear wing - two end plates plus the wing itself. All of the parts took up the grey Tamiya primer OK, so a good start. The endplates (offcuts of mounting card stuck together with Roket glue) then painted fine with artists acrylics - I'm using a mix of Daler Rowney System 3 and Winsor & Newton Finity btw, but the paint just beads up on the wing and scratches off when dry. Aaaargh!
I should add that the rear wing was assembled with 2-part epoxy - it was the last part I made before the allergy-induced hiatus - to avoid using superglue. A bit of poking around with Mr Google suggests that acrylic paints don't "stick" to epoxy resins terribly well, so I'm a little bit fubared right now. If it was something inside the cab, then I wouldn't be too worried, but this is one of the main external parts that also requires signwriting. So I need a good painted surface, not one that scratches as soon as you touch it.
Have sanded the failed paint layer and primer off, and I think I will cover the wing plane with a paper sleeve stuck down with the Rocket glue. In theory, that should give me a porous surface for the acrylic paint to stick to.
This does leave the plastic bits on the rear wing (and on other parts of the car, on which artists acrylics will also scratch.
However, the plastic is that modelling box section, so it's certainly intended to be painted over. But I've no experience at all with modelling paints, and there is a large array of different ones in the shop in town - Humbrol, rattle cans, other various different pots of stuff... So can anyone recommend me something suitable.