Cause Slight chalking or a weathered paint film is normal and desirable. Application of new paint over severe chalk will cause peeling problems. Aluminum siding can develop an excessively thick chalk layer and will require power washing to insure complete chalk removal.
Solution Remove chalk by washing siding with detergent and water. If some chalk remains after first washing, then wash again for complete removal. Rinse well with clear water. Allow to dry thoroughly.
