Cryla - Surface Preparation

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surface prep
Cryla Artists' Acrylic colour will adhere to any semi-absorbent surface that is grease free and sound. However, to ensure the longevity of your acrylic painting it is crucial that you follow a few simple steps to prepare the surface before applying colour.
Many surfaces come pre-prepared to paint acrylic onto, such as canvases, boards and papers. However, you should read the usage instructions carefully as some surfaces, such as Daler Board, are oil-primed and only suitable for oil colours and not for acrylics.
Gesso Primer can be applied by brush, roller or spray depending on the size of the surface you are painting or the tools that you have. Black Gesso Primer can be used the same way as the standard Gesso Primer if a black surface is required. Gesso Primer can be tinted by mixing in acrylic colour if a coloured surface is required. Gesso Primer does contain Titanium Dioxide pigment, so only pastel shades can be obtained.
Masonry / Coarse Brickwork Very rough and absorbent surfaces like brick should first be brushed over with a wire brush
to remove all loose material. The surface should then be washed with mild soap and water to remove any dust and grease and then rinsed. While the surface is still damp, apply a coat of Gesso Primer and leave to dry. Once dry, apply a second coat of Gesso Primer at right angles to the first. This will seal the brickwork to stop moisture and acrylic being sucked out of the acrylic colours and leave you a white surface to paint on.
Hardboard / Masonite The shiny surface of the hardboard should be lightly sanded to give it some tooth for the Gesso
Primer to adhere to. Once sanded, wash off the dust and while
still damp apply a coat of Gesso Primer. If a whiter, smoother surface is required lightly sand the primed surface and apply a second coat of primer. If a very smooth surface is required this
top layer of Gesso Primer can also be lightly sanded again.
Plaster / Plaster Board Brush over the surface to remove any loose material and ensure the surface is sound. Wash the surface in mild soap and water to remove dust and grease, then rinse. While the surface is still damp apply a coat of Gesso Primer. If the surface is very absorbent apply a first coat of Gesso Primer
diluted by 5 parts of primer to 1 of water. Subsequent layers of undiluted primer can then be applied.
Raw Canvas / Canvas Panels Rolled raw canvas should first be stretched over a frame before any priming takes place. Once stretched the Gesso Primer can be applied directly to the surface.
Cryla Artists' Acrylic colour is an excellent medium for creating murals both inside and outside. The attributes of Cryla Artists' Acrylics means that they adhere well to the surface and are water-resistant and permanent when dry. Cryla Artists' Acrylic exhibits excellent weathering resistance and the high degree of lightfastness of the pigments ensures a mural painted with Cryla Artists' Acrylic will last indoors and out.
When painting a mural there are certain procedures to follow that will ensure that your mural will last. The surface should be well prepared as detailed in the previous section. If painting the mural outside it must be done on a warm day. Acrylic colours dry through evaporation of water, eventually coalescing to create a strong paint film. The colour has to be fairly warm to coalesce properly, and the evaporation of water from the colour also cools the painting surface.
A good solution to this is to paint on a board inside and then fix it to the wall outside. Marine Plywood is the best material to use when painting a mural that is going to be displayed outside. The plywood should be primed both front and back and around the sides. Once this is done, the Cryla Artists' Acrylic colour can be painted onto the surface with your usual technique.
The mural is then complete and can be hung outside; if you require further protection for your work it can be varnished. Normal artists' varnishes cannot be used for this type of application as they are designed to be used indoors and are soft. Instead, an anti-graffiti coating should be applied if this is required, or a polyurethane-based varnish should be used. These types of varnish can be found in hardware stores and are sometimes known as yacht varnishes. When choosing a varnish to use, ensure that it is a non-yellowing variety and that it can be applied to acrylics. These varnishes are normally solvent-based so make sure that the colour has been drying for at least 24 hours before application. When varnishing the mural again ensure that the back and the sides are also varnished. Once the varnish has been applied it cannot be removed so be certain you are happy with your mural before doing this.
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