Chalking / Chalk Run-Down
 

Description:
Formation of fine powder on the surface of the paint film during weathering, which can cause color fading. Although some degree of chalking is a normal, desirable way for a paint film to wear, excessive film erosion can result in heavy chalking.

Possible Cause:
• Use of a low-grade, highly pigmented paint.
• Use of an oil-based paint. (These tend to chalk more than latex formulations).
• Aluminum siding can develop an excessively thick chalk layer and will require power washing to insure complete chalk removal.
• Use of an interior paint for an outdoor application.

Solution:
Remove chalk by washing siding with detergent and water or by having it professionally powerwashed.  If some chalk remains after first washing, then wash again for complete removal.  Rinse well with clear water.  Allow to dry thoroughly.  For the best resistance to chalking, use higher sheens such as satin or gloss.  Brick areas that are stained by "chalk run-down" should be scrubbed with a stiff brush and detergent.  Professional cleaning may be required to remove this staining.

Recommended System:
Primer
1 Coat of FLEX BON #109 Series Surface Conditioner "EPOXY BOND"
Topcoat
2 Coats of Top Quality FLEX BON Exterior Latex Paint