Paint on inside of body panels

[bbird23uk]

Hello. A technical question for a change....
Has anyone advice on paint to use for the inside of fibreglass body panels? I'll be painting the outside of the panels soon on a Lotus 23 rep with primer and 2k but was wondering what people have used on the inside where it's difficult or not required to be sanded flat. I want it satin black on inside and was also considering using a rubber type paint for the inside of the wheel arches. Has  anyone any advice? Thanks, SH