I haven't seen this published anywhere yet...
Hopefully Nick will come to the rescue!!
I suspect the revelation of WGDGLS's working-temps would be around the same recommended
working-temps of most other similar car-care products: Between 50-ish & 80-ish F.
(Everyone knows these "temp-#'s" have been broached on occasion. )
WGDGLS is promoted as being a true-protectant---An LSP...as I understand. Maintenance, then, of its application, could be accomplished by use of ones: "cold-climes-car-care-products"...
The same as for other LSP products, regardless of Brand, IMO.
Again...Just me speculating...Nick will/must know!