You will have to excuse my scepticism, nine days does not seem like enough time to let the layup cure properly.
As for the dealers claim of 3000 Units a year that would have to be a continual run of 8 a day 7 days a week to get anywhere near it.
8 a day for the std German 5 day week would only be just under 1700 units.
Sunday working in Germany is not as easy as one would expect. There are special permits required for irregular events.