Exterior wall paint

exterior wall paint

Decorating and protecting walls

Exterior wall coatings are applied on facades of buildings. The exterior wall paint not only is decorative but also protective. The protective properties are crucial due to the fact that exterior walls must last long and be able to survive in all kinds of weather conditions. Therefore, the paint is usually UV resistant and offer protection against algae, mould and acid rain. Furthermore additional water and dirt repelling properties can be reached with special protective coatings such as nanocoatings which balance the surface’s hydrophilic and hydrophobic properties.

Colloidal silica improves exterior wall paint

Colloidal silica can be used to create coatings which provide clean and fresh looking layers on facades. This is due to the unique property of colloidal silica to adjust the surfaces’ hydrophilic and hydrophobic balance. The silica also improves the hardness of decorative coating and makes them more durable. This means that the coated surface can resist scratches, abrasion and damage by knocks and bumps. Consequently, the walls do not require manual cleaning or recoating nearly as often as ordinary wall paints. Colloidal silica coatings also create a thick, flexible layer on exterior walls blocking water damp but still allowing the layer to breath.

Prepare for exterior wall paint

  1. Temporarily remove all items in close range to the surface you want to paint.
  2. Wash the surface with soap and sponge to remove all dirt and grime. Let the surface dry properly before any further application.
  3. Apply a bleach solution to to remove any mould from the walls. Mould tends to form especially on the south side of the house, where the walls are not subject to direct sunlight. Let the bleach soak in for 15 minutes and rinse it with water. Again, let the surface dry completely.
  4. Fill any inequalities (bumps, nail wholes, dents etc.) with an exterior grade filler.
  5. Use acrylic gap sealants for cracks or gaps in areas where there may be movement e.g. near doors and windows. Be sure to use paintable sealants, not silicone, on areas you wish to paint.
  6. Once the fillers and sealers have set, sand down these areas. While you’re there, sand down any rough or shiny spots to improve adhesion and finish.
  7. Spot prime the filled areas
  8. To finish, apply painter’s masking tape to fittings which can’t be removed and around edges which may be fiddly and difficult to paint around, such as trims, windows and doors.

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