Preparation & step-by-step plan
for applying microcement.

Read the substrate build-up page thoroughly.

Check the substrate

• Level, crack-free and dry
• Uniformly absorbent

Tip: a consistent, dry and dust-free substrate promotes adhesion. This makes microcement application more predictable and delivers a smoother finish.

Tiled wall as substrate? How to prepare

Tiled walls absorb unevenly (glaze vs. grout). Therefore, treat them first as follows: clean and degrease, sand the glaze, remove dust, then apply the primer.

Apply primer (included as standard in the kit)

• On absorbent substrates: dilute primer with water (1:3, e.g. 25g primer + 75g water per m²). Apply with a paint roller.
• On non-absorbent substrates: apply primer undiluted with a cloth.

Apply the primer thinly. Once it no longer feels wet (approx. 30 minutes on absorbent substrates), you can start. Use light ventilation if necessary for faster drying.

Step 1 — Apply primer

Apply the primer according to the guidelines. Then allow the layer to dry sufficiently so that the following steps proceed without problems.

Step 2 — First coat of microcement (base coat)

• Paste is already mixed to colour; however, check for unmixed pigment at the edges.
• Add 5% water if necessary for floors.
• Apply a thin coat with loose, varied trowel strokes for even coverage.

Choose between two techniques:

• Subtle pattern: apply both coats evenly.
• Pronounced pattern: apply the first coat generously, then scrape back and correct with the second coat.

Note: only apply 'wet-on-wet' to walls, not floors. Use Templex boards to move across the work area. Tape edges to prevent chipping.

Coverage: 500g per m². Check for unmixed material at the bottom or in the lid of the bucket.

Step 3 — Second coat of microcement (finish)

• Apply as soon as the first layer feels dry to the touch (1–3 hours, depending on conditions).
• Use a flexible trowel and work in a controlled manner.
• The scraping technique creates a lively, varied pattern.
• Trowel marks (build-ups) at edges can be lightly sanded the next day.

Tip: after 30–60 minutes, lightly mist with water for improved pore sealing and water resistance. Use a plant sprayer or sponge for this. Then allow to dry naturally.

Coverage: 500g per m².

Sanding — preparation for the PU coating

• After a minimum of 24 hours, sand with grit 80–180. This levels out irregularities and improves coating adhesion.
• Use quick, controlled sanding movements.
• Prolonged sanding lightens higher areas.
• Wet-on-wet application sometimes produces darker lines.

Step 4 — PU coating over microcement

• No presealer required with microcement.
• After sanding, apply PU (mix component A + B according to label).

Coverage per layer per m²: 62.5g A + 12.5g B.

• Apply within 30–60 minutes using a 2K nylon pile roller.
• Apply roller passes wet-on-wet and smooth immediately.
• After a short time, re-roll with a dry roller for texture control.

Note: PU dries transparent; excessively thick layers remain white. Only switch on a fan after application. This prevents premature skin formation.

Second layer: apply after 3–4 hours (max. 48 hours). Wear disposable overshoes and a hairnet when working on floors.

• Remove liquids immediately — do not allow coffee or water to soak in.
• Avoid rust at contact points.
• Allow PU to cure for 7 days — do not cover during this period.
• If PU coverage is insufficient: apply an additional layer.
• Storage: store microcement in a sealed bucket with plastic film on the paste; keep the edges clean.