Don’t get caught in the cold...
Painting in winter can be a challenge with the cold weather playing havoc with application and performance.
Waterborne paints are typically based on tiny, thermoplastic particles that deform and stick to one another during the stresses of drying and film formation. Particles deliberately engineered to be soft, form films easily even at quite low temperatures. The softness, however, extends to the finished film, making it prone to damage from dirt retention. Hard particles can be made, but they require heat, or large amounts of plasticising solvents, in order to form films.
A paint film dried in the cold can crack and even just dry to a powder. This is because the acrylic base needs some warmth to make the particles soft enough to stick together. There’s an intermediate set of temperatures between 5°C to 10°C where the film appears normal but looks can be deceptive as the coating is likely to have much poorer than normal durability. The surface temperature of the substrate may be considerably colder than the ambient air temperature, which creates even more of a challenge for normal paints.
The Resene Technical team first developed a small range of winterised products that will dry in temperatures down to 3°C, which have been used in winter conditions for over 10 years.
To make it even easier to choose a wintergrade finish, Resene now offers Resene Wintergrade Additive, which you can add to a range of selected waterborne Resene paints to winterise them. This will enable you to achieve a wintergrade finish in a wider range of products and colours.
Resene Wintergrade Lumbersider
(see Data Sheet D34a), waterborne low sheen.
Resene Wintergrade Additive
for addition to selected Resene waterborne paints to enable them to be applied in colder conditions.
These products can be applied in temperatures as low as 3°C. Do not apply in temperatures over 10°C – use standard Resene decorative finishes instead. Wintergrade products and paints treated with Resene Wintergrade Additive will cure at low temperatures, around 2-3°C (taking approx. 15-20 minutes to form a surface skin). Note on the labels we refer to 3°C – this is simply to provide a little extra safety buffer as the temperature may drop slightly during application from 3°C to 2°C.
Resene also offers a made to order service, so if you need 200L or more of your chosen wintergrade finish, Resene can add the wintergrade additive and do the mixing for you.
Paint that has had the Resene Wintergrade Additive added to it and the premixed Resene Wintergrade paint will both thicken when stored. If left for longer periods, the paint will be thicker to apply and will start to cause flow issues.
Always use Resene Wintergrade stock promptly – ideally within a few days, at worst within 1 month.
It is best to ONLY dose what will be applied over the next few days, and then to dose each pail as it is needed.
Recommended for Resene waterborne paints.
Resene Wintergrade Additive is more effective in lighter colours, i.e. those without high levels of tinter. While it will help the film forming and cure of darker shades (mid-tone and above, and coloured bases) the reaction is slower due to the higher tinter loading.
No, however the product is different to the standard product so we recommend that you use the same product consistently on the same wall – e.g. you would use the Resene Wintergrade Additive in all one coat for one wall face.
No, use one or the other, not both. They use similar technology and they won’t work together.
Yes, only because this wintergrade product is made in a different manner to the separate wintergrade additive. Do not add Resene Wintergrade Additive to the premixed Resene Wintergrade Lumbersider unless you would like to end up with glue!
Resene X-200 can now be used in temperatures down to 5°C. If the temperature is below that or likely to fall below that during the painting process, add Resene Wintergrade Additive to Resene X-200 to winterise it. We will be updating this on the X-200 labels and data sheets as they come up for reprint.
Do not use with Resene Wintergrade Additive. Solventborne paints are generally safer at low temperatures as they don’t freeze and tend to set up regardless. However, products like Resene Super Gloss will bloom (a milky dull appearance) on the film if cold and in high humidity.
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