ᐅ Painting - Is Priming Necessary? Which Paints Should Be Used?

Hello, we bought an old terraced house and have now wetted, filled, and finely plastered all walls and ceilings with MK1. My question is regarding painting!

Do I need to use a primer, or is it enough to dilute white paint with water and apply it as a base layer, followed by a second coat of normal white paint?

How did you do it, or do you have experience with this?

Use an inexpensive primer and spray it onto the wall with a garden sprayer. It’s faster, and 5 liters (1.3 gallons) costing around 10 euros is not expensive.

For plastered surfaces, always apply a primer first.