Remove all loose and flaking paint with a scraper or wire brush before repainting. Also sand and feather the edges. We have outlined the major benefits of priming (or undercoating), and when (and where) you may need to use a specific product. We’ve also given you a link to some of our tried and trusted “priming” products to help you make the right choice, and you can find our full range of “primers” here. When do I need a “primer” for internal walls/ceilings? Scrub the entire mildewed area with a solution of one part bleach and three parts water – clean till all mildew is gone. Use rubber gloves and eye protection. If the blisters are on the surface only, the problem is likely to be caused by painting on a warm surface or under direct sunlight. It could also be because the painted surface was exposed to moisture soon after painting.Do scrape and sand away the blisters in this case also These bubble-like appearances are caused by blistering, which happens when certain areas lose adhesion, forcing the paint film to lift from the surface. What are the possible causes?

You will know its mostly good practice to prime any baresurface before applying paint, but you’re probably confused by the number of primers on the market, and what should be used where? Painting under direct sunlight or on surfaces that are too warm. This is especially true if the coating you’re using is dark in colour and solvent-based. This can cause a headache for both walls and woodwork. If the previous colour was dark, this has can ‘grin’ through the new pale finish, meaning you may need an extra coat or two. This can be avoided by obliterating the dark shade using an undercoat on woodwork and a coat of a pale Matt wall paint on the walls. Of course, this also works if you are painting over a pale shard with a dark one, you just use a dark undercoat/matt instead. Bare plaster that is fully dry may be “primed” with a thinned first coat of Vinyl matt(“Mist coat”). Filled sections should be dealt with in the same way (i.e. patch-primed). Bare plasterboard should be primed with Dulux Trade Drywall Primer Sealer. Painting Bare Wood For exterior masonry, surfaces can variously have a high pH level (alkaline), be chalky/powdery, or staining, which can cause adhesion problems and discolouration of the finish. While in most cases, if the surface is sound and dry, there is no need for a primer, but when you need one – use one.Bare plaster that is drying out should be coated with a breathable finish such as Dulux Trade Supermatt. This primer improves paint durability and minimises the number of coats needed, significantly reducing costs. It is best suited for residential, hospitality, education, and healthcare walls. Coo-Var Alkali Resisting Primer Sealer is ideal as a high quality primer prior to painting. It is resistant to solvents and salts, is excellent on walls and plaster with easy application, and is also ideal for use on walls and plaster. The easy answer would be “always”, particularly on bare surfaces, but of course it’s not that simple. A specific masonry primer such as Dulux Trade Alkali Resisting Primer will allow you to safely paint over a wider range of pH levels without risk of adhesion loss, and we would recommend Dulux Trade Weathershield Stabilising Primerto prime/seal unstable areas. Priming FAQs

Spread the paint in zig zag M or W patterns beginning with an upward stroke to reduce spatter. Without lifting roller from the surface, fill in the gaps with parallel strokes.To ensure fair pricing, we split colours into ‘Price Bands’ to group together similar priced colours. If you wish to search for the cheapest tinted colours, always select Price Band 1. Remove wrinkled coating before repainting by scraping or sanding substrate. Apply primer and allow it to dry completely before applying the top coat Primers are used on bare surfaces (e.g. wood and metal) and are usually white or off-white, sealers are used on plaster or masonry and are normally clear or only lightly pigmented, and undercoats (sometimes called mid-coats) are used onto coated (primed or painted) surfaces and are always pigmented.

These are stipple marks unintentionally caused by the roller, mainly because of wrong painting techniques and poor equipment. What are the possible causes? Wrinkling is when a painted surface looks rough and crinkled, which usually occurs when uncured paint forms a skin. What are the possible causes? Thoroughly remove all dirt or organic matter on which mildew can feed. Use a power washer if necessary.Exposing water-based finishes to dew, high humidity or rain immediately after the paint has dried. This becomes a greater issue if the surface has not been properly prepared at first, or if the quality of paint is poor. Note: You may also be confused by the various terms used, and what the difference is between primer a sealer and an undercoat. While some manufacturers add to the confusion, it may be worth offering a general explanation. High humidity and moisture in spaces such as bathrooms, kitchens and laundry areas encourage microbial growth

Colours are sold in the nearest tin size but actual paint volume per tin may vary up to 10% depending on colour The main benefit of a primer is to even out the porosity of the surface and ensure optimum adhesion so that you get the best possible results from your paint system, but other features might include stabilising a powdery surface or helping to prevent stains ruining your decoration. Should I prime metal?" - Untreated metal requires a primer to seal it from exposure before any other paint may be applied. In certain circumstances, specialist primers will be required, for general metal work we recommend Dulux Trade All Purpose Primer

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As dictated by normal good painting practice. Care must be taken during application that the temperature is above the dew point to avoid any contamination. In confined spaces, provide adequate ventilation during application and drying. Uneven paint drying – paint film dries faster on top if you paint when it’s either very hot, or cold and damp Application: Brush only. For Health and Safety reasons related to all solvent-based paints, spray application is not recommended. STIR THOROUGHLY BEFORE USE. After suitable surface preparation, apply 1 coat of Dulux Trade Alkali Resisting Primer to bare or stained surfaces.Finish with an appropriate Dulux Trade paint system High humidity or conditions where moisture seeps out of exterior walls. This is less likely to occur if you’re using a water-based paint as it allows water vapour to evaporate without reacting on the paint film.