Can I Use Diluted Paint As Primer. Painting with diluted paint can be messy so if you can base coat the new plaster without having to add too much water will reduce paint splatter. I like to use this tool for all this. If you skip priming you risk peeling paint. Ad Get Paint Can.
You lower it into the can. Because it has a glue-like base drywall primer helps the paint adhere properly. Inspect the walls for any signs that the paint peels away or comes loose. If you are painting bare untreated wood the answer is definitely yes you will need to prime the surface first.
Apply an even coat of the paint to the walls and wait 24 hours.
Self-priming paints have improved so much that its okay to skip the primer when you paint most of the time Consumer Reports says. You can also use diluted PVA. It sticks really well to just about anything including old paint wood. The brand of paint can also reflect the mist coat ratio as some paints are thicker than others. You lower it into the can. Presume walls are bare plaster.