I'm with Kingsize about having the surface texture smoothed prior to applying colour. If you just paint&lacquer the textured surface it won't match the gloss on the body panels as light reflects differently from the textured finish than from the smooth surface on the body panels.
If you choose to sand the strips (i.e. sand through the factory underlayers), you should then apply a plastic adhesion primer meant for PE plastics. Without a proper adhesion primer you'll risk the paint flaking off later.

And the clearcoat should have a flexi agent added to it, otherwise there's the danger of it developing hairline cracks as the soft plastic flexes.