Have a crack mate, those areas are very small you can do them by hand, if you are like me and dont have airbrush skills.
Takes a long time to mix colours correctly, but as you are only touching up small areas if you can't get them perfect they are usually not noticable.
See what it comes up like after the magic eraser and make your mind up from there
absolutely - this is the only way to learn. You have nothing to lose - Have a Crack !!
