Rust due to manufacturing problems

In my experience, this problem is rare.

The solution is to insure you use a primer that will control this level of rust.  The “paint”, or coating, protects the high quality primer plus provide a pleasing, long-term, non-flaking appearance.

Even with the 50 years of experience my crew chief and I share, my manufacturer and I compared notes for the recommendation we presented to the owners of this idyllic homestead.    See the 6/29 post for the after shot

Update 2014:  Truly a rare situation.  The shingles have rusted on the underside.  The rust is affecting the coating.  The owner and I met up for a long conversation about his options–including keeping the shingles or replacing some or all.  There are advantages and cons for each of his choices.  There is no perfect answer.  My role was to inform him what to expect from available and planned formulas.