No easy way to it. Just manual fine tip brush work. The thicker lines around the windows/ windscreen are not that bad. It's those fine lines between the bodykits, doors, bonnets, hoods, door handles are the tedious ones. Just dilute your X-18 a bit and let it run along the grooves. Some touching up still need to be carried after that. But once finished, these details really add to the realism of the cars. And don't forget the bolts. Shd paint them also.