Glass looks perfectly smooth, but under magnification it is full of microscopic peaks and pits. Water clings to them, dries, and leaves the mineral spots and film that make shower screens, windows and façades look dirty days after cleaning. A hydrophobic glass coating fills and levels that surface so water beads and runs off, taking dirt with it. This guide covers how these coatings work, where they make the most difference, and how to apply one properly.

What a hydrophobic glass coating is

A water-repellent glass coating is a very thin, clear layer that bonds chemically to glass and glazed ceramic. Once cured it is invisible, but it changes how water behaves: instead of spreading into a sheet, water pulls into round beads that roll off at a slight angle. Because less water stays on the surface, fewer minerals are left behind when it dries, and what does settle wipes away easily.

Unlike glass cleaners and polishes that leave a temporary residue, a nanocoating is bonded to the surface, so it keeps working through repeated cleaning. Nanoman Glass + Ceramic is a PFAS-free coating of this kind, supplied as a two-part kit for professional application.

Where it makes the most difference

Shower screens and bathroom glass

Hard water is the main reason shower glass turns cloudy. On a coated screen, water runs off before it can dry in place, so scale builds far more slowly and a quick squeegee or wipe keeps it clear. Hotels, serviced apartments and housing developers use it to cut daily cleaning time. Our article on whether to use a nano glass coating goes into the trade-offs in more detail.

Windows, glass doors, balustrades and façades

A window nanocoating helps rain carry dust off the glass instead of leaving streaks, which matters most on high-rise glazing, shopfronts and skylights that are expensive to reach. Cleaning still has to happen, but less often and with less effort.

Glazed tiles, basins, baths and toilets

The same coating works on glazed ceramic, which is why it is sold as a glass and ceramic coating. Coated tiles and sanitaryware resist scale and soap residue and are quicker to clean.

Where not to use it

Unglazed tiles, natural stone and grout are porous and need a penetrating sealer instead; see our stone, brick and concrete sealing guide. Do not apply it to acrylic or polycarbonate. Test first on window tint film or coated low-E glass. Glass that is already etched or heavily scaled must be restored before coating, because the coating will not hide existing damage.

Preparation decides the result

The coating bonds to the glass, not to whatever is on it. Remove all grease, limescale, old polishes and sealers, then finish with an isopropyl alcohol (IPA) wipe and let the surface dry completely. Most poor results trace back to a rushed clean. Work in the shade between 5 °C and 35 °C, below 85% relative humidity, with no rain expected for 12 hours.

How to apply it

Combine Part A and Part B and dilute with ethanol or IPA as directed in the data sheet. One unit makes 20 litres of ready-to-use coating.
Spray lightly onto a section of about 1 m², or onto the applicator cloth.
Wipe in overlapping circles or figure-of-eight passes for full, even coverage.
After 2–5 minutes, buff off any haze with a clean, dry microfibre cloth.
Keep the surface dry and untouched for 1 hour. Full water repellency develops within 24 hours.
Check that water beads everywhere and re-coat any missed patches.

Coverage is 8–12 ml of ready-to-use coating per m², so one 20 L unit covers 18,000–20,000 sq ft (about 1,670–1,860 m²). That makes it practical for whole buildings, not just single bathrooms.

How long it lasts and how to look after it

Glass + Ceramic lasts up to 5 years, depending on exposure and cleaning. Clean with water, a soft cloth or squeegee and a pH-neutral cleaner. Abrasive pads, scouring powders and strong acid or alkaline descalers wear the coating down faster. When water stops beading, clean the glass and re-apply.

Frequently asked questions

Is a hydrophobic coating visible on the glass?

No. Once buffed and cured it is clear. If haze remains, it was not buffed off in time; buff again with a clean microfibre cloth.

Will it remove existing hard water stains?

No. Existing scale must be removed before coating. The coating then slows new stains from forming.

Does it mean the glass never needs cleaning?

No coating does that. It makes cleaning less frequent and much quicker, because dirt and minerals do not grip the surface.

Who applies it?

Glass and façade contractors, housekeeping teams and applicators. We supply it in trade quantities and can guide the first application.

Glass and ceramic coating guide