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flightmanual DG800B:

4.5.9 Flight at high altitude and at low temperatures
With temperatures below 0°C (32°F) for instance when wave flying or
flying in winter, it is possible that the control circiuts could become
stiffer. Special care should be taken to ensure that there is no moisture on
any section of the control circuits to minimize the possibility of freeze up.
It could be advantageous to apply vaseline along all the edges of the
airbrake cover plates to minimize the possibility of freezing closed.
Operate the controls regularly to prevent ice build-up.
It is not allowed to carry waterballast.

mvg,
Bas