How Did It Get There?


When paint of any type ages, it begins to break down.  The binders that hold the solids (pigment, fillers, etc.) together begin to degrade so the solids become loose and powdery.  This phenomenon is refered to as chalking.  When paint begins to chalk it is easily washed off, so easily in fact, that rain will wash it off.  Unfortunately, the rain only washes off a little at a time and over a period of time the repeated rinsing of the continually chalking paint frequently ends up staining whatever is below.   The classic example of this is when white aluminum siding or trim (or for that matter white painted wooden siding or trim) are above red or dark colored brick.  While chalking  occurs with all paints, regardless of color, for the sake of this explanation we will refer to all paints as white.

In the case of a gable end (the triangle above the lower portion of an end wall, below the rake of the roof) it is not uncommon to see a series of streaks or an almost uniform cloud of white discoloration that extend one to two feet below the siding.   Chalking paint stains related to trim generally are most apparent along the jamb components (sides) of the trim.  While occasionally it is apparent under a sill, generally, sills stick out far enough from the wall that the water that drips off does not necessarily land on the wall. 

Resolving this issue requires the use of heavy duty restoration chemicals and a reasonably high level of expertise to avoid damaging adjacent components (windows, shrubs, landscaping, etc.).  It also requires treatment of the source problem.  It doesn’t make a lot of sense to remove chalking paint stains from a surface if the source of the chalking paint has not been addressed.  Short of replacing all chalking trim (which has a tendency to get pretty darn expensive with minimal gain), the recommended procedure is to clean the source of the chalking paint, remove the chalking paint stains and as soon as possible repaint the siding or trim that had generated the chalking paint. 

While we cannot speak for others, our success rate for repainting aluminum trim is for all intents and purpose 100%.  In 35+ years I don’t know of one we have done that has failed.  Most last 15+ years, when finished with a high quality semi gloss or higher sheen exterior acrylic enamel.

If you really hate the look of the chalking paint stains that have appeared on your property call Hot Shot- we make your finishing problems disappear!