Apply the correct film thickness every coat to ensure paint durability and true coverage on exterior walls.

For exterior house painting you should start by matching the paint maker’s specified wet mil and dry mil targets for each coat and work backward to calculate gallons per square foot. Measure your wall area and factor porosity by noting substrate type: bare wood soaks more and requires more material than previously painted fiber cement. Use a wet mil gauge or estimate wet mil from the known spread rate on the technical data sheet and convert to dry mil using the paint’s typical percent volume solids. When calculating gallons needed add ten percent for loss from rollers, brushes, and cutting in then round up to avoid thin applications. For sealing bare wood choose a higher build primer and aim for a primer dry mil that, after topcoat, helps you meet the combined dry mil target suggested by the manufacturer. Finally plan for at least two topcoats in high exposure areas and use consistent application technique to avoid lap marks and variable film thickness.

Common problems start with underestimating porosity which leads to thin film and poor durability so test by applying paint to a small area, measure or visually check coverage, and increase primer or paint quantity accordingly. Another frequent issue is uneven application leading to visible patchiness and premature wear; prevent this by maintaining a wet edge, loading the roller evenly, and measuring mils in suspect areas with a wet mil gauge while the paint is still wet or using a dry film thickness gauge after curing. A third concern is spraying or brushing too thin to hit the required dry mils; remedy that by following the spread rate guidance on the technical data sheet, using appropriate tip sizes for sprayers, and scheduling two wet coats when a single thick coat would sag or run.

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