I had hot water pressure to my sink, I disconnected all connections for painting, hooked it back up the same way and no hot water pressure? I thought maybe vapor lock so I replaced the faucet, same thing no pressure, then thought shut off valves were bad so I replaced them, same thing no pressure, then replaced the water lines, same thing. This is a sink in a half bath off the master which backs up directly to a full bath which has full hot water pressure to the tub and sink?? I am so frustrated, please help!!

Lets start by opening the supply line just after the stop below the sink. With that line disconnected open the stop to see if you have water,if none remove the stop after closing your main, now open the main slightly. Some debris must have broken off and is now logded somewhere along the line. There are many places that will catch the debris and we just likely eliminated 2 of them.