Black Nitrocellulose automotive paint

[Willit Stop]

I believe nitrocellulose is another word for lacquer. If so, it is prone to checking and crazing mostly because it's brittle and will not expand and contract as much the metal does. It's no longer legal to sell in automotive paint stores in California. You might look into single stage acrylic enamel or urethane followed with a blender on the over sprayed edges.