As previously stated, any graphics place can reproduce. Use a good 3M type material.
As far as legality?
Appendix A to Part 43—Major Alterations, Major Repairs, and Preventive Maintenance
(c) Preventive maintenance. Preventive maintenance is limited to the following work, provided it does not involve complex assembly operations:
(9) Refinishing decorative coating of fuselage, balloon baskets, wings tail group surfaces (excluding balanced control surfaces), fairings, cowlings, landing gear, cabin, or cockpit interior when removal or disassembly of any primary structure or operating system is not required.