If everything is to stick - prime interior plaster

The plaster does not hold on the wall or the wallpaper dissolves by itself? The mistake lies in a missing or wrong primer. A little effort that can save you a lot of work in retrospect.

Why prime the interior plaster?

Whether you want to plaster or just repaint or paper, the substrate is the basis for success. Therefore, the background must first be analyzed in order to prepare it optimally.

The substrate must be tested for load-bearing capacity, adhesion and the absorption of the walls. It does not matter if you just want to paper or plaster a brick wall, the procedure is the same.

What needs to be examined in detail?

The carrying capacity

The substrate must be free from all buildup. If papering, old paint or paste remnants must be removed and crumbling areas repaired. If a plaster is applied again, the substrate must be dry and free of dust.

The absorbency

There are absorbent and non-absorbent surfaces. This is easiest to determine with a water test. If the water is taken up by the wall, the wall is strongly absorbent, if it does not suck off.


Even an externally intact plaster can have a low adhesion. Check this with a piece of strong adhesive tape by pulling it with a jerk from the wall.

Which primer is the right one?

strongly absorbentDeep Primer
little suckingprimer
not suckingSpecial primer
plasterboardDeep Primer
contaminated walls (fat, nicotine)Reverse primer
brick wallsPutzgrund

How to proceed with the interior plastering?

Simply apply the primers with a roller, puff or brush. Pay attention to an even distribution. Colored primers are helpful because you can immediately see which areas need to be treated. Highly absorbent substrates should be treated several times, first diluted, later undiluted. Also observe the specified drying times. Thereafter, the thus prepared wall can be further processed. In any case, observe the manufacturer's instructions and the product recommendations.

Tips & Tricks

Drywall or plastered plasterboard should be primed in any case, even before the first further processing.

Product Image: Yunava1 / Shutterstock

Video Board: How to Repair Plaster Walls - This Old House