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Resene textures and specialist effects Anti-graffiti systems Anti-graffiti paints should be specified as a system. When upgrading existing coatings some softer PVA and waterborne coatings are less tolerant to hard solvent containing topcoats so must be sealed off with multi-layers of tougher acrylics and where possible, the use of anti-graffiti topcoats with less aggressive solvents in them. The Resene coating most commonly used as an anti-graffiti system is Resene Uracryl (see Data Sheet R54-RA59), which combines superb exterior durability with graffiti resistance. Although the graffiti resistance of many existing coated surfaces can be improved by overcoating with Resene Uracryl, best results are achieved when the system is applied at the time of construction. Sealants in expansion joints should not be painted over with two pack products or cracking of the paint and then the sealant is likely. Often the method of application dictates the product to be used. When specifying anti-graffiti coatings, bear in mind that anti-graffiti coatings will be wasted on areas inaccessible to humans, such as the seventh floor exterior walls of a building. Coatings will not develop full solvent resistance (and therefore graffiti resistance) for at least a week, longer in winter.
Keep your cool with Resene Cool Colours Dark colours on areas such as roofing are suntraps soaking in the suns rays placing significant stress on the coating and the substrate. All dark colours absorb a lot of light. This in isolation is not an issue however in combination with the light absorption dark colours also absorb heat from the infrared rays of the sun causing significant temperature build up on the surface. White and light coloured paints reflect both light and heat and therefore are not affected. The unique formulation and materials of Resene Cool Colours allows them to absorb light so they appear visually true to colour but simultaneously reflect a large proportion of the heat falling on them keeping the surface significantly cooler than their standard counterparts. In essence, the colours work by reflecting energy in the near and far infrared region of the spectrum even though they absorb strongly in the visible region. The end result being that a Cool Colour will look the same as a standard colour but surface heat will build up slower and to a significantly lower level than a not so cool traditional colour. In hot summer conditions Cool Colours will help keep the roof temperature down, minimizing the energy required to keep homes and building maintained at a comfortable temperature. A secondary benefit is that the cool colour technology will reduce stress on the coating and substrate. Cool Colour technology performs optimally on dark colours that are the most prone to heat build-up. Resene Cool Colours are available in a range of Resene products including Resene AquaShield, Resene Enamacryl, Resene Hi-Glo, Resene Lumbersider, Resene Lustacryl, Resene Sonyx 101, Resene X-200 and Resene Waterborne Woodsman. Available in selected other products on request. See Architects memo #78 Cool eh
Resene Limelock seals in free lime Its ability to cure and seal the substrate eliminates the need to leave the plaster to cure for seven days before painting. This is of immense benefit to the contractor as they can cure and seal the surface using Resene Limelock while the scaffolding is still up, allow to dsry and then start painting on the waterborne topcoats, without waiting the usual 7-21 days. The product may be applied by the plasterer to promote cure or by the painter who wants to ensure the surface is sealed. When dark, heat-absorbing topcoats are planned, it is still prudent to wait seven days before painting. Resene Limelock traps free lime in the cementitious substrate protecting the paint finish against the appearance of unsightly lime staining, and providing a perfect base for subsequent Resene finishes. Resene Limelock is designed to be overcoated. It is considered part of the surface preparation process and should be applied as soon as possible over plaster systems to achieve maximum potential. |
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