If a wall has minor surface imperfections such as lines between remaining emulsion paint and bare plaster that cannot be sanded down to a smooth edge, hang lining paper before repainting.
Paint lids need to be securely attached, and paint should not be exposed to temperatures below 50 degrees Fahrenheit.
This reduces the need for repetitive cleaning of tools mid job.
On a ceiling/wall, it is not vital to roll first and then cut in shown, or cut in first and then roll.
Any rusty areas must be primed with a metal or all-purpose primer first.
When this is dry, the finishing paint may then be applied.