I've had very good results using water based twin pack aerosols, one for flat colour and another for clear laquer. After Googling for source bought the pair colour matched to Morgan paint code and sprayed a number plate box I had shortened to match grill width. Obviously the surface was prepared first and treated to several coats of high build primer with rub down eventually to 1500 grit wet and dry. A few coats of colour then applied followed by a lesser number (maybe just two or three) of the laquer. The results exceeded my expectations with a perfect colour match to existing paint.
Given the fact that Clemens damage is on a lower edge I would have no hesitation in making a localised repair myself using same but with thorough preparation and priming first using in this case, high build etching primer.