Spray painting an electrical cord

There is some kind of roller handle that holds paint so constant trips to the tray aren't necessary. Has anyone here used them?

Hey guys I'm jus finishing all the drywall work I did and patched up the only recessed tube lights with high hats and fans. Everything is almost ready to be primed. I'm no pro but my tape and mud came out decent but I'm sure not perfect. I'm looking for the most forgiving primer. I'm getting the hint from reading on here that the ones that are sprayed on is better. I most likely have access to a good sprayer if that's the case just wasnt sure bc there are some cabinets in and counter tops that are adjacent and on walls that are being painted. Also half of the wall being painted had wall paper on. It was 32 years old and just pulled right off did not have to scrape anything. But there is a texture on the wall still. Thinking if I lightly sand and prime it will be fine right? What's the best brand paint to go with for the ceiling and walls? All I have used is Home Depot which I think is bear and it's horrible. What finishes should I use I know it's preference but I'm not good with this stuff. Think flat for the ceiling and semi gloss for the walls. It's a basement apt but with 10ft ceilings and full window s thanks as always