For all surfaces there is a choice between two general types of preparation.
Blast cleaning to SA 2.5 Swedish Standard, or SIS SA 2.5 Power tool cleaning, hand wire brushing, chipping or scraping. Mechanical power tool cleaning is preferred.
It must be noted that all loose paint and other contamination are to be removed by grit-blasting, H.P. Washing and scraping, and washing down with fresh water.
The surface must then dry before the application of paint. Grease and oils are to be completely removed with detergent. For steel, wire brush corroded areas, preferably by means of a mechanical rotating wire brush, to leave the surface to standard.
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For a rectangular room with average sized windows and doors:
Measure the length and width. Round off each figure to the nearest half –meter and add them together. Multiply the total by the room height, then double the result. The final figure is the area of your walls in square meters. from this total subtract 1.5 square meters for each of the windows and 2 square meters for each door. Ceiling area is the length of the room multiplied by the width of the room.
If the room is an unusual shape:
First measure the height and the width of each rectangular section to be painted. Multiply these figures to get to the area, and then add them together for the total area. A Stairwell often forms part of a triangular shape. For the area of the triangle, multiply the lengths of the horizontal and vertical legs and divide by two.
If you plan to paint the trim a different color calculates these areas separately.
Allow 2 square meters for each side of a door and 1.5 square meters for a single size window frame. A skirting board area is its height times its length (which is generally the same as the perimeter of the room.) When you know the total area, you will cove you have half the information you need to order paint. The rest depends on the covering capacity of your paint and the surface it must coat