Is it possible to buy flytspackel at Byggmax and use it in a friggebod? That is, what ambient temperature does the flytspackel require to dry this time of year?
According to the datasheet for one of the fillers they sell, the temperature should be at least 10 degrees.
It will likely still cure at slightly lower temperatures but probably a bit more slowly. However, deviating from the manufacturer's instructions is at one's own risk, so I would try to stick to at least 10 degrees.
