Some of you asked about the modelling felt I used for the bowl. I just had a look and it is from a german company called "Güterman". It has a description on it in 10 languages, so I guess they do export it to many countries. I can try to give you the name in various languages:
English: modelling felt
French: Feutre Artisan
Italian: Feltro sagomato
Spanish: Fieltro artesanal
Swedish: Hobbyfilt kraftig
Hope there is no typo and I didn´t get the languages mixed up ;-)
The felt comes in sheets of 30x45cm and is very thin and sturdy. Like cardboard.
Hope this helps. The bowl is now completely dry and it keeps it´s shape perfectly. Will definitely work with this stuff again as it is very easy to handle.