There are times when I have to drive my '05 ST in nasty winter weather; hence the change to Blizzaks in early December. So, I am in the slush and the salt a good bit.
After trying a few waxes known for durability, I have settled on Collinite. Collinite 845IW is very easy to use (I wipe it on with a foam applicator, and wipe off with a mf towel), and it lasts well through the "wand washes" the ST suffers during winter.
A couple of coats before winter sets in, and I am good to go. If I get a nice day, I will wash, and apply another coat. When using it, do shake the bottle hard for a minute first.
There are those who like Collinite's 476 even better for durability. Could be, but the 845 seems readily available. And, it looks almost as good as my summer LSP (Opti-Seal).
A synthetic wax (non carnuba) will last a log longer than the carnuba but won't leave the depth to the paint you get with the carnuba. It will look really shiny but won't have that depth. Carnuba lasts a good month though and thats about it. (living outside that is.)
I'm interested in the same subject.....but I'm looking for a wax locally available, like Auto Zone, Advanced, O'Rileys. My past experience left me believing that waxes harder to apply, last longer. Any suggestions appreciated....
I like Klasse products any time. A coat of "all in one" and then a coat of "sealant glaze" and you are good for four months at least. You probably have to order it online, such as autogeek. Sold as a package deal.
There was a meguire's paste wax back in the day, it came in a blue and white tin, I beleive it was called #12, was a real tough wax to apply, and a lot of hard work to remove the excess, but it was hands down the longest lasting and best shining product I had ever used, but it was almost un-usable....I can wax my car with meguire tech paste wax from start to the last wipe of excess in 30-45 minutes.....the #12 would take me 3-4 hours on a car the size of a focus.
That said, I'm not sure if there is a specific wax for winter, I'd suggest going with the product you use and trust, keep it clean, and do what you can to shorten the time between re-application.