Before painting radiators, cut off the hot water supply and connect it again only after the paint is thoroughly dry. When warmed up, the freshly painted surface gives off quite a strong smell, which subsides over time. Old radiators should be cleaned of rust and primed, new ones are usually factory primed and only need to be covered with a primer and a covering layer.
Copper pipes connected to radiators can be painted in the same way. Secure the wall with cardboard.
We paint panel radiators with a brush with a width 2,5 cm, in hard-to-reach places we can use a narrow brush or a special roller for painting gaps. Try not to allow stains to form. Do not paint over the connectors, as this may make disassembly difficult later. You can use most universal paints, however, avoid metal pigments, which reduce thermal radiation.