Snowcem FAQ’s
Modern paints fail by peeling and flaking mainly because they contain polymers. Polymers make them faster to apply and give options for satin or sheen finishes, for example. The price is lost breathability. Claims that they are breathable are only partly true, as they most definitely reduce the vapour permeability of an otherwise permeable surface. This means that moisture can be trapped under the paint, which leads to early failure of the paint or, worse still, damage to the wall surface beneath it. Such deterioration happens in both cold winters and hot summers. This is because trapped water expands under freezing conditions, and produces a high vapor pressure when hot. Paint with low adhesion will tend to peel and paint with strong adhesion fail the wall surface to which it is applied.
There are examples of houses which were painted with Snowcem more than 30 years ago. After 25 years or more, we would not expect the paint to have failed in any way, flacking, for example. It is normally just a case of freshening up the surface by over-coating with more Snowcem. Other paints last much less time because they include polymers that reduce the vapour permeability of the surface, which promotes water related failure and peeling.
Snowcem exterior paint works and is long lasting on walls made of concrete, cement render, GRC, plaster, pebble dash, brickwork, sandstone and limestone masonry. The main point is that the surface must not be failing in some way. In such a case, or where a wall is already painted, use of Chemprover might be considered before applying Snowcem. In case of doubt, email or phone the experts at Northern Paints.
It depends on the condition of the surface to be painted, although preparation is often not necessary. As for all paints, grease, oil, loose surfacing and contamination should be removed. It is useful to jet wash after cleaning, removing all traces of cleaner/detergent. Washing does not have to hold up painting, however, because the surface does not need to be dry. The main requirement is that the surface is sound and porous to some extent. Concerning ‘soundness’, particular attention must be given to checking rendered or plastered walls in case this has become disbanded/delaminated. Light tapping with a hammer (hollow sound) is useful for locating areas that need to be broken out and made good before painting. To check that a surface is porous, just splash it with clean water and note if the water beads off (not porous) or soaks in and darkens the surface (porous). In case of doubt, email or phone the experts at Northern Paints.
It depends on the method of application and the texture of the surface, pebble-dash taking the longest time and smooth render the least. Snowcem can be applied by brush (Northern Paints accessory), micro-fiber pad (Northern Paints accessory) or spray. A brush is a good way of stippling and painting very coarse surfaces such as pebble dash. For blockwork, and other open texture surfaces, or where a smoother finish is required, a micro-fiber pad gives a fast way of painting. Spraying does not suit many situations because of overspray (eg windows). In the case of spraying, you must expect to increase the water content and apply a number of thin coats. A large nozzle diameter will be necessary for this. Hand operated backpacks have been used but nozzles need regular unblocking.
Drying time depends on a number of factors including the ambient temperature, air movement, porosity of surface and paint thickness. Using a spray, which is not normal, drying time, can be less than 15 mins. In all other cases, drying time is about 1 hour. Curing, the process by which paint increases in strength, takes longer.
Snowcem can be applied by:
1 – brush (Northern Paints accessory),
2 – micro-porous pad (Northern Paints accessory) or
3 – low-pressure spray.
Use of paint rollers is not recommended. Brush is good for very rough surfaces, micro-porous pad for open texture or smooth finishes and spray for extensive walls and industrial applications. Brush design has a great influence over hand comfort, weight of paint held and surface filling. For this reason, we strongly recommend our Snowcem No1. hand-made brush, designed, tried and tested specifically for Snowcem painting.
Snowcem can be sprayed, using a large nozzle diameter, low pressure and higher water content. Several coats are necessary to build up the coating. Spraying is not normally recommended due to overspray on windows, for example.
Snowcem is water and rain resistant, with high vapour permeability (breathability).
There are examples of houses with 30 years’ old Snowcem paint, with no peeling or flaking.
Just add water to the Snowcem paint powder (see information sheet).
Cement is hygroscopic and thus will go hard if exposed to damp air, even without adding water. For this reason, Snowcem should be used as a complete bag. However, provided a part used bag is not left open, sealed with tape, and stored in a warm dry place, it might stay good for a year or so. When coming to re-use, it must be discarded if it is not a lump free powder. Never store cement bags more than five high, otherwise the lower bags will go hard and useless.
The amount of water you add, depends on what you are using Snowcem for. As a normal paint, mix Snowcem powder into clean water in the ratio of 1.0:1.0 by volume (1.30:1.00 by weight). If you can borrow the bathroom scales (protect with clear plastic), most people find weight based mixing more reliable than judging volumes. One idea is to get two spare buckets, one marked with water level and the other with powder level. A third bucket is used for mixing the power and water. NEVER ADD WATER TO PREVIOUSLY MIXED PAINT (will reduce strength of paint).
Electrical safety: mains electrical power cables should be fitted with RCD devices.
- Use a purpose built mixer or a battery/electric drill fitted with a suitable mixing paddle (Northern Paint Accessory).
- A low speed setting is to be used.
- Whilst continuing to mix, add the Snowcem powder carefully and gradually (avoid a dust cloud) to the measured water and then mix thoroughly for 5 minutes.
- Leave to stand for a further 5 minutes and then mix for 30 seconds.
- Aim to mix only sufficient paint for your needs, based on how much paint you can use in say 45 minutes.
Northern paints accessories include low cost gloves, dust mask and goggles, all recommended when mixing. Gloves should be used when painting.
No, years of use prove that Snowcem is accepted as a safe DIY paint. Snowcem is cement powder that is mixed with water to form a naturally alkaline based paint that resists mosses, algae and mold. The powder and the dried paint can have a dehydrating effect on skin, possibly causing mild irritation. If sufficient care is not taken when adding the paint powder to the mix water, the result may be a dust cloud. When adding the powder, it makes sense to wear overalls (or old clothes) a paper mask, goggles and gloves, all available as low cost accessories from Northern Paints. When using the mixed paint, overalls, head cover, gloves and the odd mug tea or coffee are a good idea.
Yes, years of use prove that Snowcem is accepted as a safe DIY paint. See also answer to “Is Snowcem paint toxic or dangerous to use?”
Snowcem has no solvent, VOC’s or leachable hydrocarbon content; making is suitable as land fill waste, for example. Snowcem’s long life, during which other paints fail and have to be applied multiple times, means less energy and CO2 emissions associated with Snowcem paint manufacture, transport and use.
Snowcem’s durability makes it a highly Sustainable Building product. Nowadays, sustainability is frequently gauged by the energy (gigajoules) and the CO2 emission (tonnes) associated with the production of one tonne or cu m of a product. The life of the product needs also to be related to the whole life of the building or structure that uses it i.e. how many instances of the product are necessary in its whole life, 120 years, for example. In this period, Snowcem might be applied say 4 times, compared with say 12 times for other paints.
Snowcem is ideal for use on concrete. If the existing surface is in good condition, it is not necessary to remove surface laitance.
Snowcem is a cement based material and, therefore, ideal for use on cement-sand render.
Snowcem can be used on plaster. However, it is important to make sure the surface in not weak or dusting. In such cases, Chemprover can be used to strengthen and stabilise the surface before applying Snowcem.
Snowcem is a cement based material and can be used on masonry bonded with OPC or heritage type cement mortar.
Snowcem can be used on bare wood-timber surfaces, such as plywood. This is not a normal use for the product, however, and its durability will probably depend on the timber species and exposure.
Snowcem is a cement based material and can be used on natural masonry stone such as sandstone and limestone.
Lime can degenerate when wetted. For this reason, it is recommended that lime plaster surfaces are treated with Chemprover prior to applying Snowcem Paint.
Snowcem, mixed correctly, with the right amount of water and applied on a suitable surface, should not crack.
Care must be taken when using Snowcem Paint in very hot weather, as essential water, needed for hydrating the cement, may be evaporated. In such circumstances, we recommend the surface is thoroughly wetted before commencing, and the painted surface kept damp using a water spray during the 8 hours following application (not too much too early).
Snowcem cannot peel, and will not flake if applied to a suitable sound surface.
Snowcem, which has no volatile content or fumes, has a harmless characteristic cement smell.
Yes, high vapour permeability, commonly called breathability, is a feature of Snowcem that is not found in other paints, the reason why they do not last as long.
Use clean water.
This depends on the type and porously of the pavement surface. Sheeting over is recommended (Northern Paints accessory) as it may be difficult to completely remove splashes using water only. In such cases, special cleaners may be required (consult Northern Paints).
Snowcem will not affect PVC or sound paintwork. In all cases, it should be washed off as soon as possible, using plenty of clean water,
Snowcem is should not be applied if there is a risk of freezing conditions at the time of application or within 7 days following application. If painting in hot weather, care will be needed to prevent loss of the water that is essential for hydration and strength gain. In such circumstances, we recommend the surface is thoroughly wetted before commencing, and the painted surface kept damp using with a fine water spray for 8 hours (not too much too early).
Yes, Snowcem can be applied in damp weather conditions, but not when it’s raining. You should avoid painting if rain is likely during application or within 3-4 hours following completion.
Snowcem gives an extremely hard surface that is resistant to weather and airborne contamination. It has proved durable is many coastal situations, lighthouses, for example.
Snowcem is available in pure white and shades. A colour chart is available from Northern Paints.
Yes, there is no reason why Snowcem cannot be used indoors on masonry surfaces, it has no solvents or fumes. Smoother finishes can be achieved by spray application.
Yes, if you are painting over existing Snowcem its recommended that you use Cemprover primer before the application of the paint. For other coatings make the surface as sound as possible, remove as much of the flaking or peeling, blistered surface before the application of the Cemprover primer and then apply 2 coats of the paint.
No problem, but the surface should be improved with Cemprover surface improver and interbonder before applying Snowcem paint.
It makes sense to take some precautions, especially when working with powders. This topic is covered fully under “Is Snowcem paint toxic or dangerous to use?”
Snowcem Plus Masonry Paint is suitable for all masonry and stonework surfaces. Snowcem Plus allows the substrate to breathe and so will protect your masonry surfaces compared to a polymer-based coating.
Snowcem Plus Masonry Paint is simple to mix and may take a little longer to apply than polymer-based paints, but this is time is well spent because it will stay looking good for years. Full mixing and application instructions are included in every tub.
Northern Paints and Coatings supplies Snowcem Plus Masonry Paint. You can order online or give us a call on 01665 494034. We charge a flat fee of £6.00 per order for delivery throughout the UK and Highlands and Islands. We can also deliver anywhere in Europe, using low-cost shipping. We are also developing a network of local stockists throughout the UK.
Try us, give us a call on 01665 494034 or email us at sales@npc-ltd.co.uk. We like to think that Northern Paints and Coatings are the Snowcem experts.
Contact a local decorator or builder and tell them that you want to have your house painted with Snowcem Paint, and where to get it. Make sure they use the genuine product, we are more than happy to give technical advice to tradespeople if required.
Snowcem has been used on many Listed Buildings.
Snowcem comes with many advantages over polymer-based paints. It’s longer-lasting and because it does not contain polymers. it doesn’t reduce the vapour permeability (breathability) of the wall surface, which is the reason why it remains on the surface even in severe weather regions. Other paints trap moisture between the paint and the substrate and fail by peeling or flaking.
Applications more than 30 years old exist. If properly applied to a suitable surface, you can expect a life of more than 25 years. 10 years life is more normal for other paints.
Unlike other paints, Snowcem is alkaline, which means it does not support moss and aglae.
Sunlight is the main cause of discoloration, because UV radiation affects the colour pigments in the paint. Paints with resin content are susceptible in this way. Snowcem Paint does not have such content and keeps its colour.
No, it will not. See also “Will Snowcem Paint discolour?”
Yes, Snowcem Paint is resistant to UV radiation. See also “Will Snowcem Paint discolour?”
Snowcem gains substantial strength and adhesion on the painted surface. It also does not trap moisture behind it. These characteristics means it able to resist freeze-thaw attack.
No, Snowcem Paint is vapour permeable and preserves the breathability of the surface. This means it does not trap moisture or water.
Two coats of paint are recommended.
This depends largely on the texture of the surface, rougher surfaces needing more paint than smooth. For example, when mixed, a 10KG tub of Snowcem Paint powder yields 14 litres of liquid paint, typically enough to cover approximately 25 sq m of smooth wall surface using 2 coats of the paint.
Snowcem is ideal for farm buildings, especially in exposed climates. Its alkaline nature means it does not support biological contamination, moss and algae, for example.
Snowcem is a permanent paint, not easy to remove. Remove as for cement, scabbling, for example.
See “How do I mix Snowcem exterior paint?”
There are two methods you can use to mix Snowcem paint, using either volume or weight of the material. To mix by volume use any device to measure out equal quantities of both powder and water. Add the powder to the water and mix until all the powder is incorporated into the liquid. To mix by volume use 1kg of powder to 700g of water. Again as before add the powder to the water and incorporate all the powder into the liquid. For a thicker mix hold around 1 quarter of the liquid back on the initial mix and add more liquid to get the consitency required.
Any unused paint should be sealed and stored in the tub provided.
No.
Yes, you can download the datasheet here from the Northern Paints and Coatings website. You will also receive a Technical Data Sheet with every tub of paint you buy.
Yes Snowcem Plus Masonry Paint is highly breathable. We have had the paint laboratory tested for vapour permeability to BS EN ISO 7783:2018 standard and the SD value for the paint is below 0.01. This makes Snowcem Plus suitable for any masonry surface which requires the application of a breathable coating.
Snowcem has a cement content, so it can be used to make a render mix together with soft sand and water. Colour outcomes will be influenced by the sand colour. We do not provide mix designs for this.
Yes. apply the paint with either a brush or spray apply with an HVLP spray system or a hopper fed spray gun on a compressor
Yes. We suggest you use either a block brush which is better for filling/stippling the uneven surface, alternatively you could spray apply the paint using either an HVLP spray system or a hopper fed spray gun on a compressor.
Snowcem Plus Masonry Paint is one of the UK’s oldest and most trusted brands for painting masonry surfaces. It is a very traditional product with a heritage stretching back decades. Made from natural minerals Snowcem Plus contains no plastics, polymers or VOC’s.