Harsh Canadian Winters? Under its blanky in its newly heated garage maybe!
The BEST products I have in my cabinet just have to be...
Blackfire Wet Diamond Polymer Spray
Blackfire Wet Diamond Waterless Wash
Blackfire Crystal Seal...and...
cQuartz Finest
Before our trip around Canada and the US I did a Crystal Coat and then wiped the car down with the Waterless Wash when need during the trips. The car ONLY saw two car washes where it was hit with water near the end of the trip. This shot was taken after about 4 hours driving up the coast...looks pretty clean doesn't it? I did not clean it or wipe it off before any of our trip shots...only first thing in the morning each day.
IMO the best one can do for their car short of professional application is Blackfire Crystal Seal as it is a ceramic coat and VERY easy to apply compared to the rest. It does not dry quickly, unlike cQuartz Finest, and it self levels which it does very well. It lasts months on your finish, whether paint or a paint protection cover like Expel, as I have. I actually believe Crystal Seal is the only spray on sealant such as this and one can just spray on, spread out, let dry for 10 minutes and cloth polish (not necessary). It is mistake 'goof proof' as my wife likes to say, unlike cQuartz Finest.
cQuartz Finest, on the other hand, is the best for a reason and requires a good day of application. It dries very quickly so if you have any lifts, such as would occur where your cloth stops and then moves back on panel ends, you need to pick them up within 30 minutes.
After applying any quality ceramic seal, it is very good to check it over by shutting all the lights off in your garage (if this is where you are doing it) and then checking the entire car over with a LED flashlight. This will show you any smudging or lifts left behind very easily.