I’ve got an old set of props here, I’m going too WD40 them and stick them in the freezer, although I do expect some freezing as it’s a lot colder. Experimental
Yes, WD40 does freeze . Its freezing point is -81.4 degrees Fahrenheit. To prevent freezing, you should store it between this temperature and no warmer than 120 degrees Fahrenheit.
Maybe right at the the back of my fridge we’re it freezes up, not the freezer
Henrik has done a second test …
Sheep fat 
I commented on the WD one about joining GADC, he’s deleted it 
Thanks so much for the flight report, great to learn about risks. without having to experience the scaryness directly.
Ta, good to know.
I had this error message today flying in 4 degrees at an altitude of 70m in Sussex. Sunny day no humidity. Decided to land straight away…no ice in props though
Hi @ukflyer, it looks as though you’re quite new here 
Why not nip over to the Introductions page, and say hello properly and tell us a bit about yourself. 
might be true, never seen sheep in a field on their backs with legs in the air due to frost…
I will chuck in the idea of polishing the blades with silicone grease - I think it is harrmless to plastics.
Can anyone tell me how ice can form on blades whizzing round at thousands of rpm ? I would have thought centrifugal force would intsantly throw it off.
Anyone had a props icing issue with this cold spell
Yesterday morning, I took the Air2S up to 120m for a quick photo-op. It was cold but felt dry - no icing on the props. After 2-3 minutes of flight I did get a reduced power warning, where I presume the batteries were getting cold.
Even though I kept the drone inside until I was ready to take-off, the temperatures still got to it.
I have a Mavic 2 pro & wanted an extra spare battery, the only one I could find was an enterprise battery, self heating and good to -10 (apparently). Not used the heating function yet though.
Do you have to toggle the heating on?
Manual or automatic ( on the enterprise),when battery temp reaches 8deg it goes into temp maintenance mode. It comes on when temp drops below 6 deg. The functions are within the battery so guessing will work similarly with my machine.
That’s really cool, or “hot” I suppose 
Full-size flying, the rule is if total air temperature is below +10 deg. C and “visible moisture”, then beware of icing.
Propellors suffer icing at higher temperatures than you’d think because in the process of “sucking” air, they drop the local pressure, and thus temperature, which causes the temperature to drop below freezing, and any moisture in the air to freeze. Super-cooled water vapour can remain in a LIQUID state to -40 deg. C (!), but it will freeze INSTANTLY on contact with anything cool/cold (even particles of dust in the atmosphere - this is what causes things like hail to form).
Consequently, the propellors drop the local temperature, the water hits freezing point or lower, then hits the blades, and freezes to them.
You also have the moist adiabatic lapse rate to consider. It may be +3 deg. C at ground level, but if you climb to 400 ft, it will have dropped a full 1 degree celcius; perhaps slightly more.
You also need to beware of precipitation. Not all precip reaches the ground, but it will have fallen out of the cloud at a lower temperature. When you fly your drone through such conditions, it will freeze to the propellors. This is a particular concern when flying near cloud base in cold temperatures.