Finishing enclosure for a device - scratch-free

Hello!I'm working on 3d designing of an enclosure for a device and looking for a way to finish the 3d printout. It should the scratch-free.The device will look very similar to this one:https://www.ebay.com/itm/Integra-Bio...-/264475308630Attachment 14443I would like to use light-gray or white textured paint and a very durable strong clear finish, like is used for cars. Ideally - sprays.I would very much appreciate any help.Thank you.Ilya