System

Polyurethane Surface Sealer

The finishing step — seal your plaster surface against water, stains and daily wear.

Coverage 8 m² per litre

Cure Time Touch-dry in 2 h

Skill Level No experience needed

Specifications, explained

The numbers that decide how a cast behaves — and what to watch for at each step.

Base Water-based polyurethane: Low odour, no solvent smell; rinse tools with water before the film dries.
Coverage About 1.5 m² per 500 ml, three coats: Roughly 3 m² per litre of finish; a single very thin coat spreads far further (about 8 m²/L).
Pack sizes 500 ml bottle · 1 L refill: Two bottles cover most DIY runs; the refill is cheaper per square metre.
What it protects Interior gypsum casts, decorative and daily-use pieces: It hardens the surface — it does not make gypsum waterproof or food-safe.

Touch dry 30 minutes: Dust and hair stick to a tacky coat, so work somewhere clean.
Application Dip the piece for 20–30 s, then air-dry: One dipped coat cures into a glossy protective layer.
Full cure 24 hours: Do not wet or load the piece until the film has cured through.
Before the first coat P2500 (2000-grit) sand, then remove all dust: Sealer locks powder into the surface — wipe until a white cloth stays clean.

Water test A drop should bead, not soak in: If it darkens and disappears, the film is worn and needs another thin coat.
Cleaning Damp cloth, mild soap: Abrasive cleaners dull the film faster than they clean it.
Refresh Re-coat when beading stops — about yearly for daily use: Recoating thin costs far less than repairing a stained surface.
Storage Sealed, 5–30 °C, protected from frost: Frost ruins water-based PU; bring the bottle back to room temperature before use.