Painting the exterior of your home

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If the surface is very bad then it may be necessary to wash some of it down first with a detergent solution to remove dirt, grease etc. Obviously this is not an easy thing to do on the outside of a house, but it will help give the best results. Rinse off with clean water and allow too dry.
Carefully scrape back to a firm edge all areas of poorly adhering or defective coatings and rub down thoroughly to "key and feather" broken edges of existing coatings. Treat any areas affected by mould, lichens, algae and moss should be cleaned with a good quality fungicidal wash . Make good minor defects with an appropriate filler.
New or sound bare surfaces should be sealed with a thinned first coat of the masonry paint to ensure good adhesion of the finishing coat(s). Surfaces that remain powdery, friable or chalky after thorough preparation should be sealed with a coat of stabilising primer, but never seal sound, new or bare surfaces with stabilising primer as it will do more harm than good. New wall and pillar caps have been coated in a shuttering grade oil during manufacture and should also be treated with a stabilising primer prior to first coat of masonry paint.
Painting in direct sunlight (unless you have managed to get every brush stoke exactly the same thickness) allows the paint to dry in a patchy way and can give a poor result.

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