Rayson SealForce AC10

Exposed surfaces that shed water: roofs in new construction and refurbishment, old roof tiles, external walls, and roofs crowded with penetrations, drains and roof lights. It is applied cold from the pail and left exposed. It is not for roofs where water ponds for long periods, or for surfaces people walk on.

As a roof coating, two coats at about 0.7 to 0.8 kg/m² each. As roof waterproofing, three coats with polyester reinforcing fleece bedded into the first. A 20 kg pail covers about 25 to 28 m² per coat, so about 12 to 14 m² at two coats or 8 to 9 m² at three. Porous or uneven surfaces and wastage take more.

AC10 is the one-part acrylic for roofs that drain freely and are not walked on: pitched and tiled roofs, external walls, and sound roofs that need an economical recoat. RC40 is the two-component aliphatic polyurea for flat roofs that pond, carry foot traffic or plant, or have to stay elastic from −35 °C to +80 °C. If water stands on the roof after rain, it is an RC40 roof.

Yes, once the roof itself is sound. Loose tiles are fixed, broken or missing ones replaced, and the roof pressure-washed and dried; AC10 then goes on in two coats. It renews and seals weathered tiles and lets them breathe, but it does not repair a leak: a roof that leaks at a broken tile, the ridge, a valley or a flashing needs that repair first.

Yes, external walls are one of its uses: the wall is cleaned, cracks and joints are repaired and reinforced, and AC10 is applied in two coats. In an HDB block or a condominium the external wall is common property, so the Town Council or the management corporation arranges the work; in a landed house it is the owner's.

Yes, on concrete, render, brick, stone and tiles: one coat of Rayson SealForce AP05 at about 0.15 to 0.3 kg/m², two on very porous surfaces, left until it has dried clear — at least 1 hour, and within 24 hours of the first AC10 coat. Metal is abraded to a bright finish and takes an anti-corrosion metal primer instead, and a sound old coating gets a trial area first.

Dry weather. Each coat has to be protected from rain, damp and condensation until it has dried, with 6 to 24 hours between coats. Apply between +10 °C and +35 °C, at no more than 75% relative humidity, on a substrate at least 3 °C above the dew point and with no more than 5% moisture. In Singapore that means planning the coats around the rain, above all during the Northeast Monsoon from November to January, and on an exposed roof working in the cooler morning or late afternoon, before the sun heats the surface past 35 °C.

No. It must not be used on roofs where water ponds for long periods, and it is not recommended for direct pedestrian traffic. Correct the falls so the roof drains, or use SealForce RC40, which is walkable and resists ponding water.

White, grey, green, clay brown, brick red, tile brown, red and black, with other colours on request. Applied colours are approximate to the chart, and the colour can shift slightly in direct sunlight without affecting how the membrane performs.

SealForce AC10 is part of Rayson's upcoming waterproofing release. Send the project details and your required date, and Rayson will confirm supply timing, colours, quantities and, where you need one, an applicator in the Rayson network before you commit.