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    Pat McDonnell Paints

    For store locations please click here

    Tel: 021 432 0200
    Fax: 021 432 0194

    info@mcdonnellpaints.ie
    http://www.mcdonnellpaints.ie

     
    Home > Product Advice > Cladding & Exterior Paint > What is the best way of applying water based paint to wooden surfaces?
    What is the best way of applying water based paint to wooden surfaces?

    Frequently asked questions:
    Q. What is the best way of applying water based paint to wooden surfaces?
    Painting tips for the application of water-based wood treatments The ideal weather for painting outdoor wooden surfaces is in slightly windy conditions (good air flow). You must paint in dry conditions – no fog, rain, etc. It must not be sunny (as the coating will dry too quickly and will leave an uneven colour finish). Ideal air temperature: +5°C Don’t paint on a damp day (relative air humidity must be below 80%) The humidity of the surface must be below 18% (preferably 12% ±2%). It is up to the customer to ensure that the wood is adequately dry (but not totally dry). If the wood is too wet this will cause adhesion problems. If the wood is too dry this will cause the coating to crack. Don’t get too caught up in this – it is only in the extremes that problems occur. Where possible you should try to paint a sample piece of the wood that you intend on painting first. All wood is a different shade, and is in a different condition, therefore when you paint your wooden structure it will be different a finish and a different colour to the sample pieces shown in our brochures. Apply an extra coat on the edge pieces as the edges are most susceptible to attack and to letting moisture in. ‘Pinjalac Edge Cover’ is especially for edges. It is a transparent protective coating. Always paint in the direction of the wood. Stir the coating before and during application (this ensures colour consistency). Tip: Darker colours ensure better protection against solar UV. Try to find out what the previous coating was. If it was an oil or an acrylic then you need to recoat it with an oil or an acrylic (even if it is just the primer – for example, to over coat an oil system you could use an oil based primer with an acrylate topcoat. Dark blue / black are not good colours to use on wood. They get too hot (especially if they are used on a south wall), and the resin bubbles out of the wood. Pine and other coniferous woods (spruce, cedar, fir, etc.) have a lot of resin in the knots. In very hot weather the sun can heat up the resin in the knots and the resin can bubble and push off the coating. It is therefore best to apply a knot blocker prior to painting. The blocker is Oksalakka (deco range, 1L) – or the temadur hardener will do the exact same job.  

     
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