Hi,
      Well, the spectral analysis doesn't reveal the presence of 
any of the compounds which make-up Water Wetter - check it out yourself at RedLine's MSDS publication: 
http://www.redlineoil.com/msds/17.pdf  There is no mention of any Potassium (Kalium) in RedLine's publication for instance. 
      The Lab's conclusion also mentions that the 
gel is consistent with a 
Long-Life Coolant - exactly what the Boxster uses.  The OEM coolant is the equivalent of Artego Coolant in europe and Texaco / Havoline Dex-Cool here in the US.
      If you review Havoline's Dex-Cool MSDS - 
http://www.havoline.com/images/products/pdfs/anti_exlife.pdf , you'll see that it contains 
Potassium 2-ethylhexanoate in a fairly abundant quantity, 2nd in abundance along with diethylene glycol.
      Spectral analysis is a very sound testing method, but the conclusions drawn from it are where there is room for error.
      The analysis is 
not consistent with the chemical make-up of Water Wetter, nor does the Lab specifically identify the sample as being Water Wetter - only a 
Coolant Booster.  There may be other 
Coolant Boosters (more like conditioners which Water Wetter really isn't) which have a chemical make-up consistent with the sample, I don't know.  The information given to us and upon which I made my initial and subsequent research and replies was Water Wetter.
      But, the results 
are consistent with the make-up of Long Term coolant.  We already know that Water Wetter was added to the Fuel system either mistakenly (not knowing the proper fill point) or absent-mindedly. What is the possibility that the same was done with Coolant, perhaps even with no cognitive knowledge or memory of it?
      I make no prediction one way or the other, except to say that the analysis does not rule out, and may actually seem to favor this as a possibility.  
      The reported Time Lag is also nagging at me because I cannot believe that an issue such as this would manifest itself so long after the supposed cause was introduced (9 mos.), though without further research, I must allow the possibility to remain open that it well could...
Happy Motoring!... Jim'99