I am in the process of painting my F1 truck and didn't put a thick enough coat of paint on the box sides. They have 2 coats of 2K urethane clear on them and I was wondering if I can sand this off and add more paint or is it best to use paint stripper and remove the clear and the paint and start over? I have a 2 part epoxy primer underneath the base coat. Any help is appreciated. Thanks