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Don’t get caught in the cold

...

Maximise midwinter work with Resene Wintergrade paints

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.

The Resene Wintergrade range of products includes:

 
 

Resene Wintergrade Lumbersider
(see Data Sheet D34a), waterborne low sheen.

Resene Wintergrade Sonyx 101
(see Data Sheet D30a), waterborne semi-gloss.

Resene Wintergrade Quick Dry
(see Data Sheet D45a), waterborne primer undercoat.
 

Wintergrade Additive

Resene Wintergrade Additive
for addition to selected Resene waterborne paints to enable them to be applied in colder conditions.

All of 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.

How fast should wintergrade paint be used?

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.

Resene Wintergrade Quick Dry can be used over a longer period but do not store over spring/summer.

What paints can Resene Wintergrade Additive be used in?

  • 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.

    • If colours are required, tinting formulas must be adhered to. Excess tinters may inhibit the low temperature curing nature of the product.
    • The key is to ensure there is time for the paint to cure and it’s not too cold.
    • E.g. A painter must avoid using the additive in dark colours on a cold day after 3pm on the south side of a house.

Do not…

  • Do not use in non Resene paints!
  • Do not add Wintergrade Additive to the three premixed Resene wintergrade paints, unless you would like to end up with glue!
  • Do not apply in temperatures above 10°C.

Will the Resene Wintergrade Additive alter the original colour?

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.

Can you add Resene Wintergrade Additive and Resene Umbrella Additive together into the same product?

No, use one or the other, not both. They use similar technology and they won’t work together.

Can you use Resene Umbrella Additive in the three premixed Resene Wintergrade products – Resene Wintergrade Lumbersider, Resene Wintergrade Sonyx and Resene Wintergrade Quick Dry?

Yes, only because these three wintergrade products are made in a different manner to the separate wintergrade additive. Do not add Resene Wintergrade Additive to the three premixed Resene wintergrade paints, unless you would like to end up with glue!

Update for X-200

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.

Solventborne paints

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.

Resene Wintergrade products in use:

Copthorne Hotel

Copthorne Hotel

Repainting the expansive exterior and interior of the Copthorne Hotel in Durham Street, Christchurch entailed the application of litre upon litre of coating. Exterior concrete ribbed panels were coated in an impressive 600 litres of Resene Wintergrade Hi-Glo gloss acrylic... more


Durie HIll Elevator tunnel

Durie Hill Elevator tunnel

With just a single day each year allocated to maintenance there is no allowance for downtime when faced with the challenge of repainting the Durie Hill Elevator tunnel. A team of eight painters armed with Resene Wintergrade Lumbersider were charged with washing down the tunnel and applying two full coats ready for reopening just a day later... more


Hawkes Bay Opera House and Precinct

Hawkes Bay Opera House and Precinct

Formerly known as The Hastings Municipal Theatre Complex, the Hawkes Bay Opera House & Precinct in Hastings Street, Hastings, best known for its reputation for being one of the best lyric theatres of its type in New Zealand... more


Lakeside apartments Wanaka

Lakeside apartments, Wanaka

A difficult site close to downtown Wanaka combined with a full level redesign, made the finishing of the ambitious new Lakeside Apartments, at 9 Lakeside Road Wanaka, even more of an occasion to celebrate... more


Palmerston North Commercial Union building

Palmerston North Commercial Union building

Anyone who says that you can't paint in temperatures as low as 2° C and re-coat on the same day is WRONG. Doug Miller Ltd was presented with a challenge - to repaint the exterior of Palmerston North's Commercial Union Building and its basement carpark in conditions well below the recommended 10° C drying temperature... more


The Clocktower

The Clocktower at the Cardrona Alpine Resort

With the ability to cure at temperatures as low as 2°C, Resene Wintergrade Lumbersider enabled this high altitude clocktower to be painted without jeopardising the full cure of the paint system... more


Clarence St Theatre (formerly Westpac Community Theatre)

Clarence St Theatre (formerly Westpac Community Theatre)

Near freezing temperatures were no barrier to the repaint of the Clarence St Theatre in Clarence Street, Hamilton with Resene Wintergrade Lumbersider used on the coldest of days in light colours to keep the work humming along... more


Resene Paints Ltd

Resene Paints Ltd   – www.resene.com

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