What are the consequences of painting over indoor copper Cat 5e or Cat 6 cables?
Avoid painting over any indoor telecom products. When you must paint near telecom product, remember: the jacketing materials are “porous” and have little resistance to moisture; the paint could alter the flame and/or smoke characteristics of the cable; painting over them would likely obscure the flame rating designations, which are required to be printed on the jacket; and painting the cable voids the product warranty.