It is very difficult to find the same grey pain texture to fix the paint chips. You may want to consider to repaint the entire face.
I use grey sharpie to fix the chipped paint.
I use grey sharpie to fix the chipped paint.
My Trackmaster/Tomy/Plarail Photo Gallery Page (over 600+ photos and still under construction)
https://www.flickr.com/photos/183311600@N03/
https://www.flickr.com/photos/183311600@N03/