Most often they work with a roller and a brush.

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Consult with a sales consultant. This will help you avoid making gross mistakes and buying unsuitable material.
When using branded building materials, such as Knauf plasterboard and putty, you should inquire what the manufacturer says about the primer. It is not surprising that this company's range also includes a primer that is recommended for use with plaster and putty.
The Knauf company produces a primer for plasterboard.

Application Features

Working with primer is very simple. Without having any car owner data skills, you can easily apply it yourself. For work you will need:

paint roller;
construction or paint brush;
paint tray.
You will need a roller and a brush.

First of all, you should read the instructions. It specifies the proportions in which the material should be diluted. You can also buy a ready-to-use mixture (it is important not to confuse one with the other).

Pour the diluted mixture into a cuvette.

The primer diluted according to the manufacturer's instructions is poured into a tray, the roller is soaked, squeezed out and the product is applied to the walls.

It is important not to leave any drips or drops, as they will dry out and come off along with the putty. If you do not want to cut the drips off flush with the walls with a knife, make sure there are no drips.