No, Of Course Not! The best and most serious sea kayak outfitters in Norway will not require you to have a sea kayak certification 'wet card' to rent a kayak and go out without a guide.
Anyone can buy and paddle a sea kayak in Norway without having to first complete any form of sea kayaking certification. Therefore, no sea kayak certification is needed to do a self-guided trip in Norway. And this applies to Norway’s entire coastline. Also, insurance companies do not require this as a prerequisite to insure adventure outfitters in Norway.
Kayak More Tomorrow was the first professional sea kayak outfitter in Norway; we started outfitting self-guided groups 9 years before the Norwegian ‘wet card’ was conceived.
(The Norwegian ‘wet card’ was conceived as a money grab for the Norwegian Canoe Association, who wanted to cash in on the growing popularity of recreational sea kayaking. It was not first and foremost safety measure as one would think; this still applies today.)