I made over a year ago this one.
Still have to try it with SUP.
and yes, that white stuff on the garden table is what you guys sometimes read about, ,its called snow.
doesnt stop us from wavesailing and SUP although the other frozen version (ICE) does slow you down a bit.
(last weekend in the canals of Haarlem-Netherlands)
lh5.googleusercontent.com/-nE1tzzqkvJo/UVf1i7n_p3I/AAAAAAAAK6c/NY_EfYYMlTQ/s597/%5BUNSET%5D lh3.googleusercontent.com/-hDuwKmVEnRM/UVf1jmzCSOI/AAAAAAAAK6g/EAP7tNJJxlk/s597/%5BUNSET%5D I did a 12km tour and there was only a couple of hunder meters that where not frozen (yes there where i checked if i could paddle and started a bit too optimistic).
The Ice was everything from slushpuppy to a tiny little film till too thick so paddle around and find a course.