When using a roller to paint a large wall, if you don’t do it right you’ll end up with lap marks where you paint over a part of the wall you previously painted. To avoid them, make sure you overlap the places you painted previously before the paint has dried.
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Fungicidal paint: A paint which discourages growth of fungi on its dry applied film. The fungicidal properties are normally conferred by the addition of special additives; although certain pigments, such as zinc oxide, commonly used in paints may themselves contribute the fungicidal properties of the paint.
Of course it takes a lot of time on the job to become a really good painter, but not all jobs require that fine touch. If you work with someone who does have years of experience, you’ll be corrected when you err, and painting mistakes can almost always be corrected (learning how to fix them should be one of your priorities).