Rubber Paint for Metal Surfaces

Rubber Paint for Metal Surfaces from SILK PLASTER is an elastic, waterproof and weatherproof coating applied over an anti-corrosion primer on steel and galvanised metal surfaces such as gates, railings, fences and roofing. Below you will find surface preparation, application technique, coverage and long-term durability of Rubber Paint for Metal Surfaces. Explore the full SILK PLASTER RUBBER PAINT range.

Metal calls for special care: a thin film will not stop corrosion, and an over-rigid one will crack with thermal movement. SILK PLASTER RUBBER PAINT combines elasticity, water resistance and UV resistance, and works together with an anti-corrosion primer. It suits most domestic and commercial metal structures.

Suitable applications

Gates, wickets and metal fences.
Wrought-iron railings and grilles.
Gutters and downpipes.
Metal doors and canopies.
Garage doors and metal garage walls.
Hangars, tanks and reservoirs for non-drinking water.

What makes the coating distinctive

The elastic film does not crack with the thermal expansion of metal - dark surfaces can reach +70 °C in summer and drop to -30 °C in winter. Rigid coatings craze quickly under such cycles and let water reach the substrate.

Once cured, the film is waterproof: rainwater no longer touches the metal, slowing corrosion. The coating is UV resistant, so the colour stays stable outdoors.

Preparing the metal

Strip rust, mill scale and flaking paint with a wire brush, grinder or, ideally, abrasive blasting. Degrease oily areas with white spirit or a dedicated degreaser. After mechanical cleaning, treat rust spots with a rust converter and let them dry.

Prepared metal must always receive an anti-corrosion primer based on acrylic or alkyd chemistry. Without a primer the topcoat will not last, even on galvanised steel.

Application

Apply two or three coats. The first may be lightly thinned (up to 5% water) for smoother flow; the rest are applied neat. Allow 1.5-2 hours between coats at +20 °C.

A roller works well on flat surfaces, a brush on wrought-iron details and complex geometry. For large surfaces - hangar walls, big gates - a sprayer is more efficient.

Application conditions

Work between +5 °C and +30 °C. The metal must be dry and warm before painting: applying paint to cold metal under high humidity causes condensation and adhesion loss. Avoid rain or any risk of precipitation in the next 4-6 hours.

For galvanised steel, choose a primer compatible with zinc - standard alkyd primers tend to peel off galvanised surfaces.

Coverage and service life

Consumption is 200-400 g/m² in two coats, depending on how smooth the metal is. As a guide, 1 kg of paint covers about 5 m² in two coats.

Refreshing the finish is simpler than with alkyd enamels: clean the surface and apply one fresh coat. Chips and scratches are touched up locally, with no visible boundary between old and new film.

Advantages on metal

Unlike hammer-finish enamels, SILK PLASTER RUBBER PAINT does not blister on hot metal and does not crack in frost. Unlike powder coating, rubber paint needs no oven to cure - it can be applied on site after installation of the structure.

Common mistakes on metal

Painting over rust without a converter - orange stains will bleed through within one or two seasons.
Skipping the anti-corrosion primer - even galvanised steel needs a primer compatible with zinc.
Painting cold metal when dew is settling - adhesion suffers. Paint when the metal is sun-warmed and dry.
Trying to cover in a single thick coat - paint runs off vertical surfaces. Two or three thinner coats are better.

Frequently asked questions

Can a galvanised roof be painted? Yes - always with a primer specifically rated for galvanised steel. Without one, any paint will peel quickly.

Is the paint suitable for stainless steel? Yes - after light abrading and a coat of adhesion primer.

Can a cast-iron radiator be painted? Not recommended: above +90 °C the film may lose elasticity. Radiators need a heat-resistant paint.

Does the paint protect against corrosion better than alkyd enamel? The paint itself creates a waterproof barrier, but corrosion protection comes from the primer. The two layers work together.

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.