Additives
Extra-strong plaster mortars thanks to admixtures
Admixtures, also known as mortar enhancers, are high-quality blends designed to enhance the physical and mechanical properties of building materials for both indoor and outdoor applications. By incorporating these admixtures into the mortar, tensile strength and adhesion increase, making them suitable for applications with significant vibrations, exposure to frost, and on wall heating systems. Admixtures can also reduce water absorption, making the plaster particularly suitable for applications such as plastered facade plinths (drip edges). When used as a bonding layer, it increases resistance to shear stresses which is ideal for smooth and closed surfaces.
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Why is it important to prepare the surface?
- you can often finish it with a simple primer.
- OR you may have to further remove the surface, for example in the case of loose parts.
- OR you still have to pre-process by so-called dust-free “shot blasting”. This removes the top layer and any contamination from the surface and "roughens it", or increases the surface area for better adhesion. Excellent for all kinds of leveling compounds and screed floor mortars to adhere to.
Is it necessary to apply a primer before plastering?
A primer ensures better adhesion of the plaster mortar to the substrate. This is especially important for smooth, closed and porous or highly absorbent surfaces. Where plaster mortar without a primer would have difficulty bonding properly. In addition, a primer also ensures even absorption of the plaster mortar, making it easier to strip off the plaster mortar and polish it, sand it or finish it with a trowel.
Should I dilute primer?
Omnicol supplies ready-to-use primers that do not need to be diluted. Open the packaging, stir, and you're ready to go. Only the suction-reducing plaster primer ZV (FIX+ R and FLEX+ are also dilutable) omnibind can be adjusted to the suction of the substrate by dilution.