Cessna paint jobs are not the best in the world, some low hour XL/XLS and 680 have external paint erosion and skin corrosion problems, if you operate or night stop in a coastal location make sure that you keep the aircraft washed and clean, Phase 6 or ID 22 checks should be carried out, also engine comp wash should be carried out regularly.
Engine bleed valve seats can corrode, then engine out and back to Pratts, very expensive. Airframe paint tends to go around skin lap joints and windshield areas.
Best regards,
om15