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I got a chance to talk with Smart USA's Engineer about this question on what causes the crazing:

It is UV exposure. As of March 2012 production a new roof material has been introduced. It addresses the tendency to craze/crack as the old roof did from UV exposure.As for spare part availability this is still an open question. The main supply is going directly to production so spare part stock does not get filled as quick.It will be available in spare part supply, but I do not have an exact date at this point in time.
 

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I got a chance to talk with Smart USA's Engineer about this question on what causes the crazing:
jefferios, thanks for sharing but this ah-ha moment on the part of the smart Engineers is long overdue. Did they happen to mention the miracle product they chose to replace Makrolon® with?

Hard to believe that it took so long to come to the same conclusion as many smart owners had long ago.
 

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I got a chance to talk with Smart USA's Engineer about this question on what causes the crazing:

Quote:
It is UV exposure. As of March 2012 production a new roof material has been introduced. It addresses the tendency to craze/crack as the old roof did from UV exposure.As for spare part availability this is still an open question. The main supply is going directly to production so spare part stock does not get filled as quick.It will be available in spare part supply, but I do not have an exact date at this point in time.
Soooooooooooooooooooooooo................

Now that DVI has "acknowledged" it as a DEFECT, are they going to replace at no cost?? :rolleyes:

Inquiring minds want to know :wink:
 

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Im still not 100% convinced. UV damage, yes likely. But in conjunction with a bad "batch" of ingredients sounds more likely to me. My 2010 roof, this minute is clear as glass corner to corner. It has been subject to far more UV that I would prefer. At least spring, summer, fall and winter of 2010 at the dealer. Then spring of 2011 at the dealer when I bought it "new". I don't have a garage but I do cover it. Yet it is in the sun a certain amount of the year I have owned it, can't help it. I'm not bragging, it doesn't make complete sense. Believe me, I'm still waiting!
 

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True jet. I've had people tell me their roofs are fine then I show them the proper way to see the first signs and they see the light.
 

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Soooooooooooooooooooooooo................

Now that DVI has "acknowledged" it as a DEFECT, are they going to replace at no cost?? :rolleyes:
:rofl2: :rofl: :rofl2: :rofl: :rofl2:
So chief, I'm guessing that you haven't had your pot of coffee yet today?

I can hear the response now - I'm sorry sir but that happened under the PAG administration, please call Roger Penske . . .
 

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For an analog...

...look no further than the headlight covers on most American made vehicles. The yellowing that you see is another form of the problem, and I have seen this problem on four year old vehicles.

Plastic is made of a number of components, one of the most important being the plasticizer used to keep the material flexible. Transparent plastics are particularly prone to losing this substance, and when it departs, the surface from which it leaches (the outside, exposed to ozone and weather) loses its flexibility, then allowing cracking.

The cleaning kits that you can buy actually remove this outer layer, restoring the transparency, but deceasing the dimension.
 

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I can see you but I can't hear you so well! :cool:
Say again? :D
No worries, jet can't see OR hear so well. Ask him about what it was like when they used to write on stone using berry juice as ink. :eek: That was when he was a young man. When he was a kid they used tablets, not the type we have now. He said it was something about hieroglyphics....
 

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This "engineer" is a liar. The new roof on the car in the showroom has the SAME Webasto label and the SAME part number as the first one in my 2008. There is no difference between the last of the 2 replacements put on my car and the brand new 2012 sold yesterday to some unsuspecting klutz. Webasto made them all out of cheap Makrolon, the material used to make a 10c CD-R. This material, Bayer Chemical who manufacturers it and Webasto who turns the crap plastic into Smart sunroof panels is NOT listed in ANY way on the USA approved list of plastics and manufacturers of auto glazing (windows). It should never have been allowed past the port of entry docks.
§571.205Standard No. 205, Glazing materials. :: PART 571--FEDERAL MOTOR VEHICLE SAFETY STANDARDS :: CHAPTER V--NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION :: Title 49 - Transportation :: Code of Federal Regulatio

Plastic glazing finally looks promising
We're the guinea pigs....from this webpage:

"Bayer MaterialScience's plastic glazing material (Makrolon) is currently being applied to various Smart and DaimlerChrysler models. The rear triangular windows of the Smart ForTwo, Smart Roadster and Smart ForFour, for example, are made of Makrolon AG 2677. The transparent roof module of the Smart ForFour is another of the current applications for Makrolon. DaimlerChrysler uses Makrolon for the louver roofs of its A and B class models."

"Battenfeld has partnered with the mould maker Summerer and Exatec (as developers of an external plasma coating) to make plastic glazing. Battenfeld's so-called IMPmore (In-Mould Pressing) process works by injection-compression because plastic car windows must be virtually free of stress to ensure the necessary weathering resistance and to allow effective anti-scratch coating. An executive of Battenfeld told us: "The main advantage of this process -- especially for very large mouldings is that the mould pressure remains very low. So we can achieve mold pressures of about 180 bar whereas for conventional injection compression the mold pressure would be about 210 - 230 bar. The main advantage of the IMPmore process is for making mouldings in excess of 0.7-square metres. For Summerer and Exatec, the mouldings will be 1.4-square metres for a roof module. This is the largest mold for a mass produced car."


Meanwhile, Krauss-Maffei has sold a 3,200 ton Revolution two-platen press to Freeglass to mould glazing for the Smart car. The unit is located at Freeglass' site in Schwaikheim, Germany."

They've poured a lot of money into making this failing sunroof disaster. It was a failure that needs to be RECALLED and REPLACED with a completely different panel that is made of a US-approved material that doesn't craze in 12 months (they even craze on the showroom floor under the UV of the flourescent lights!)

Lots more information from Google search:
https://www.google.com/search?q=plastic+glazing+regulation+for+vehicles+in+USA&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
 

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Larry, do you have a build date or possibly a VIN of the car? Since it is March 2012 who's to say those roofs haven't made it across the pond yet.
 

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H'mmm. When I posted that the rear quarter windows were made of a plastic material, I was shortly thereafter corrected by someone who stated that they had aways been made of glass.

Perhaps it is possible for the "experts" on here to be wrong occasionally...
 

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Soooooooooooooooooooooooo................

Now that DVI has "acknowledged" it as a DEFECT, are they going to replace at no cost?? :rolleyes:

Inquiring minds want to know :wink:

In our dreams. I'm very pessimistic about Daimler being gracious here.:(
 
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