Application of Ultraline and Polyline selflevelling floorings

Priming of screed<.h2> Priming and filling is carried out on dry and clean prepared surfaces. Under self-leveling floors and other thick, continuous coatings, the substrate is primed until the pores are filled and the surface is glossy. A high quality priming coat can only ensure a high quality base coat! If necessary, the surface must be primed several times.

Polybond single-component primers are characterised by high penetration capacity. The number of coats and material consumption depends on the surface quality of the substrate. The primer is applied by roller, brush or airless spraying. Primer consumption is 100-200 g/m2 if one coat is applied in one pass. If necessary, the primer can be applied in several layers. If the primer becomes opaque, foams or other side effects occur, the work must be stopped immediately until the causes are eliminated. These effects indicate unacceptable moisture conditions. It is recommended to apply other materials on top of the primer after the primer has dried completely, but no later than 24 hours. A screed floor is a convenient means of levelling the subfloor. The material is rather finicky, so wooden and mineral surfaces need to be primed before application, according to the instructions for use.

Why a primer is needed

Screed floors are complex mixtures based on cement or gypsum binders. In simple terms, it is a screed (levelling) material with high mobility, which works in thicknesses from 1mm to 100mm. Before applying it, manufacturers require thorough preparation of the substrate:

• Remove old coatings, including bituminous, paint and varnish;
• Clean off dirt, oil stains, soot and grime;
• Thoroughly remove dust with a hoover or damp cloth;
• Prim the surface.
• Let us mention the last point. A primer for liquid flooring provides:
• Strengthen the substrate and binds residual dust.

In a nutshell, the primer binds particles of the substrate, increases its strength, and reduces the level of sand erosion from the concrete. It is especially good on loose mineral screeds.

1. Loose screed
2. Loose, weak screed.

Improved adhesion of the materials.

With the rapid drying of the mortar, there is a high risk of separation of the screed layer from the base floor, the formation of bubbles, cracks and cavities. A properly selected primer significantly reduces the likelihood of these defects.

Uniform flowability (mobility) of the mortar;

Ideally the mortar should spread as evenly and neatly as possible after spreading onto the base surface. Two factors help to achieve this effect: pre-levelling of local areas and priming.

Reducing the absorbency of the substrate.

If a mineral or wooden surface "draws" water from the mortar, it quickly becomes thicker and the workout time decreases. In addition, this has a negative effect on the strength of the new layer. To compensate this effect, as well as to increase the density of the concrete or gypsum screed, saturating or waterproofing primers help. Thus, the primer treatment increases the workability of the screed and reduces the likelihood of various defects (cracks, bumps, cavities, weak areas).