Facade painting
with liquid rubber — breathable & crack-bridging

Clean the facade thoroughly — a pressure washer (min. 100 bar) removes algae, dirt, loose paint and chalking. Mechanically remove loose, flaking old paint (scraper, wire brush). Pre-fill cracks > 1 mm with repair mortar and let cure for 7 days.

For algae or fungal infestation, pre-treat with an algae/fungus remover, let act for 24 h, rinse thoroughly and let dry for 48 h.

Pro tip: The Sellotape test checks old-paint adhesion — stick a strip on and pull off sharply. If paint stays attached, the substrate is sound; if only flakes come off, full removal is needed.

On strongly absorbent substrate (fresh render, lime sandstone, old lime render) or heavily chalking old paints: apply a hydrophobising deep primer. Reduces first-coat consumption by up to 30 % and significantly improves adhesion. Let dry for 12 h before further work.

On sound, closed paint, primer can be skipped — proceed directly to Step 3.

Pro tip: Apply deep primer thinly — a thick coat forms a glossy film that worsens main-coat adhesion.

Apply with lambswool roller (short nap, 10 mm), brush or airless sprayer (15–18 MPa, nozzle 0.021–0.026″). Dilute with up to 5 % water (sprayer up to 10 %). Diluted, the first coat penetrates the substrate and forms the bonding base. Consumption 100–200 g/m².

Particularly careful at connections to windows, doors and plinths — these detail points demand gapless coverage.

Pro tip: On tall facades use a cherry picker or scaffolding — never ladders above 4 m; the risk is too high and work quality suffers from a wobbly position.

At 23 °C and 50 % RH dry for at least 4 hours. Wait longer in cooler weather or high humidity (up to 8 h). Test: the coat must no longer be tacky to finger pressure and leave no impressions.

Protect the facade from direct sun (streaking) and rain (softening) during drying — stretch a tarpaulin if uncertain.

Pro tip: Follow the sun — start on the west side in the morning, work to the east side in the afternoon. This avoids direct sun during drying.

Apply the second coat cross to the first for even coverage. Consumption again 100–200 g/m². Undiluted for full layer thickness. Rain-resistant after 6 h (manufacturer specification), fully load-bearing after 28 days.

On the weather side (south/west) a third coat is recommended — UV and rain load there is 2–3× higher than on protected sides and otherwise shortens service life.

Pro tip: Judge the final colour only after full curing (28 days) — fresh coating looks slightly milky, especially on the shaded side, but clears up completely.