Rubber Paint for Roofing

Rubber Paint for Roofing from SILK PLASTER is an elastic, waterproof and vapour-permeable coating that protects metal, slate, felt and flat roofs while staying flexible from -60 °C to +90 °C. Below you will find surface preparation, application technique, coverage and long-term durability of Rubber Paint for Roofing. Explore the full SILK PLASTER RUBBER PAINT range.

The roof is the first part of any building to take the brunt of the weather - summer heat, heavy rain, hail, snow load, daily temperature swings and ultraviolet radiation. The condition of the roof determines not just how a building looks but how well its insulation, structural elements and interior spaces are protected. SILK PLASTER RUBBER PAINT forms an elastic, waterproof, vapour-permeable layer on the roof that works as a full protective coating, not just a colour finish.

Why rubber paint suits roofing

The defining feature of SILK PLASTER RUBBER PAINT is the elasticity of the cured film. After drying it stretches by 70% or more without tearing, accommodating the thermal movement of metal sheets, slate or bituminous substrates. That eliminates the hairline cracks through which water normally finds its way in.

The coating retains its working properties across a temperature range from -60 °C to +90 °C: it does not crack in frost and does not soften under direct sun. Light shades reflect more heat and reduce the temperature of the space beneath the roof - a useful effect for inhabited attic levels.

Suitable roof types

Metal roofs: galvanised steel, profiled sheeting, standing-seam roofing.
Slate (asbestos-cement sheets).
Roofing felt and bitumen-polymer membranes.
Onduline and bituminous shingles.
Flat concrete roofs and screeds.
Previously painted surfaces after appropriate preparation.

Surface preparation

The life of the coating depends directly on how the surface is prepared. The roof is cleaned of dust, debris, leaves, moss and lichen. Loose or flaking old paint is removed mechanically with a scraper or wire brush. Greasy patches are degreased; rust on metal is brushed off and treated with a rust converter.

Cracks, holes and joints are filled with an elastic sealant or an acrylic-based repair compound. Metal surfaces benefit from an anti-corrosion primer; highly absorbent substrates such as slate or concrete should receive a deep-penetrating acrylic primer. The surface must be completely dry before paint is applied.

Application technique

The paint is stirred thoroughly before use. The first coat may be thinned with water by 5-10% to improve penetration into the pores of the substrate. Subsequent coats are applied undiluted.

A velour roller is suitable for most surfaces, a brush for hard-to-reach areas, and an airless sprayer for large roofs. The optimal number of coats is two to three, with each new coat applied perpendicular to the previous one. The drying interval between coats is 1-2 hours at +20 °C and 60% relative humidity.

Working conditions and coverage

Painting is carried out at air and surface temperatures between +5 °C and +30 °C, with relative humidity no higher than 80%. Avoid painting in direct sunlight, in strong wind, or shortly before rain - precipitation within the first 4-6 hours can damage the fresh film.

Consumption is 200-400 g/m² in two coats, depending on porosity and roof profile. A smooth metal roof comes in nearer the lower end; slate and roofing felt absorb more. As a guide, 1 kg of paint covers about 5 m² in two coats.

Durability and maintenance

Properly prepared and applied, the coating keeps its protective and decorative properties season after season. It can be washed with water and mild detergents and does not need annual recoating. Local damage is easy to touch up: fresh paint blends seamlessly with the existing film and leaves no visible boundary.

SILK PLASTER RUBBER PAINT is a practical choice for owners who want a durable, elastic, watertight roof without resorting to multi-layer waterproofing systems.

Advantages over other roofing materials

Compared with bituminous mastic, rubber paint does not soften in the heat and does not stain the surface - it forms a dry film you can walk on within a day. Compared with alkyd enamel, SILK PLASTER RUBBER PAINT is considerably more elastic and keeps its grip when metal expands and contracts with temperature.

Liquid rubber gives a thicker layer but needs professional equipment and complicated application. Rubber paint works on the same principles but goes on with an ordinary brush or roller - well within the reach of any careful homeowner.

Common mistakes and how to avoid them

Painting onto a damp surface - the leading cause of peeling in the first season. Make sure the roof is dry, especially at seams and overlaps.
Skipping the anti-corrosion primer on metal - even the most elastic paint will not hold back rust beneath it. Priming is mandatory.
Laying the first coat too thick. A thin, penetrating coat works better - it builds adhesion, after which heavier finish coats can follow.
Painting in hot, direct sun. The surface skins over while moisture is trapped inside the film, causing blisters. Work in the morning or in overcast weather.

Frequently asked questions

Can an old slate roof be painted? Yes - after clearing the moss, treating with an antiseptic and priming. The coating bridges micro-cracks and helps protect the sheets underneath.

Is the paint suitable for the roof above a habitable attic? It is. Light shades further reduce heat build-up in the under-roof space and improve the attic’s climate.

Can the paint be applied over existing bituminous coatings? Yes - after cleaning and using a primer compatible with bitumen. The elastic film prevents further cracking of the bitumen layer.

How many coats are required for reliable waterproofing? Three coats give the most secure seal: one thin penetrating coat and two opaque finish coats.

Rubber Paint by surface

See the full Rubber Paint product page for colours, pack sizes and technical data, or the step-by-step application guide.