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painting exterior brick primer in Northfield

Sunday, May 08, 2011

Preparation Guide for Painting Exterior Brick Primer in Northfield

Concrete, cement, plaster, painting exterior brick primer in Northfield and stone each have different characteristics and you will need to reference this in conjunction with the sort of exposure the surface will experience. For example the cement walls of a storage closet will not need as much attention to water proofing as an exterior-facing cement wall.

The hardness of plaster varies according to the lime content in it but in general plaster is highly porous. This porous surface reduces the spreading capacity of the paint, especially with the first coat of paint. The easiest type of plaster surface to paint is Spray Applied Plaster because this has a hard uniform surface with less porosity. Fibrous Plaster requires a primer coat because it is highly porous. A dry plaster surface works well with a water-based, mineral silicate or emulsion paint for most coats. If you are unsure it is best to play it safe and use a primer for the best surface lifespan.

Provided they are correctly applied over uniform substrates, cement rendered surfaces present no decoration problems. Incorrect mixing and application will however cause variable porosity and unevenness of texture, resulting in an unsatisfactory paint finish. Newly-applied renderings are highly alkaline and initial decoration should consist of a solvent based concrete sealer topped with emulsion or water-based paints.

You may consider using a pressure cleaner and soft wire brushes to clean off the surface beforehand. Always ensure that brickwork is completely dry before treating the surface (This could take a few days of continuous sunshine to achieve). "Underfired" common bricks can contain salts which will damage and discolour paintwork applied before the brickwork is dry. Fill in any missing joints of gap before painting. A waterproofing primer is a good idea as a base for brickwork painting.