Independent: We will tell you exactly what we think of a product and we would never recommend anything we wouldn't use ourselves. This is caused by painting over contaminated surfaces such as wax, oil or polish. The paint cannot adhere to the surface and draws away leaving unpainted areas. This can also be caused by contamination on the brush. Putting it right Tiles Clean with sugar soap, then wipe over with white spirit to get rid of any dirt and soap scum. Use a specialist glass, tile or difficult-surface primer followed by paint, or Ronseal One-Coat tile paint (which needs no primer).

New Plaster and very porous or powdery surfaces should be primed first with filler coat diluted 1 part to 4 parts water and allow to dry. Resins present in knots causing light coloured paints to discolour or even flake. Resin bleed and flaking is a common problem where dark colours are used on south facing elevations. This is because dark colours absorb more heat than light colours. If you want colour make sure to prime and undercoat properly and use the best exterior wood paint to give a good finish. Expect to repaint every three to five years. What is the Best Way To Paint Plywood Edges? If you are using a powdered filler, mix this according to the product instructions to a paste, ready to apply to the wall. Step 4 Undercoat is applied after primer paint and provides a smooth, even layer to apply your final coat of coloured paint onto. Some good quality paints combine an undercoat with the paint, resulting in a smooth and even finish without the need for a separate undercoat. Woodwork Defects and When You’ll Need To Use A Wood PrimerStabilising solution is used on powdery surfaces. This primer creates a seal over the surface, stopping the powdery surface from interfering with your paint system, as well as preventing your paint from penetrating the porous plaster surface.

In most cases, you should prime your surface before you start painting. For wood or metal painting projects, it is essential to prime your surface. Because wood is porous, a layer of primer paint stops your paint from soaking into the wood. Primer also helps your subsequent coats of paint to adhere to your surface – especially important for metal or glossy surfaces.Make sure that all filled areas are rubbed down smooth and level. You will need to prime the filler before painting to prevent subsequent coats being absorbed more rapidly than on other areas. Use a coat of Dulux emulsion thinned 10-20% with clean water. Once this is dried you can apply a full coat of Dulux emulsion.

Whether that be brush or roller, either will work. I would recommend using a roller and cutting in at the edges with a brush. Surface types include all mineral surface gypsum, cement plasters, lime plasters, thin layer mineral plasters, concrete and plasterboard. Application: Apply a generous coat by airless spray followed immediately by tipping off with a medium pile roller. For airless spray application, we recommend a minimum working pressure of 140 kg/cm² (2000 Ib/sq in) with a spray tip size of 19 thou and a fan of 12 inches. May also be applied by brush, roller or conventional spray. When applying by spray, work into all pores and voids with the first pass, then finish with a full coat. If applying by brush, remove brush marks with a partially loaded roller while the filler is still wet. Do not apply if the surface temperature is below 10°C. Apply in a V or W shape to get an even spread of paint. Use the brush to even out paint on the edges or any areas where paint has accumulated. When the primer is dry, rub down with a fine grit (180-220) sandpaper and wipe clean with a damp cloth. You may need another coat of primer. Follow the same process as the first coat.MDF Unpainted MDF needs sealing before painting. Use a specialist sealant such as Johnstone's MDF primer followed by an undercoat, before glossing or eggshelling.