Is mid-upper 50's to low 60's (the forecast for this weekend) too cold to use Wolfgang TSR and/or FG followed by DGPS?
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RE: Chemists. They formulate car-care-products according to manufacturer/vendor/re-seller requests...application temperatures are more than likely one of those requests.
For example:
Liquid Glass wants you to place the vehicle in direct sunlight/thermal heat for best curing.
Prestone Anti-Freeze is said to perform its stated duties to certain -F degrees, if mixed properly.]
That said:
-It seems most vehicle-surfaces' car-care-products claim optimum performance between 50-80 degrees F. (within your stated temperature range)
-But...The "air's" ambient temperature, wind-speed, and even humidity that encompasses the area where vehicles are having car-care-products applied to them, may come into play also.
-I also go by the
surface temperature of vehicles' panels, which can dramatically change, over a given time frame, when a wind-chill factor and/or humidity must be factored in.
-This "panels'
surface temperature" is stated to be lukewarm. But what is the "lukewarm" temperature range, then? Lukewarm, or tepid, is often described as affording a comfortable temperature range between 65-90 degrees F.
IMO...Then...Finding out whether, or not, if any of the vehicles' panels are not so properly tempered, could result in
hypothermic/hyperthermic shock to any particular car-care-products, will be best manifested upon one's own personal observations while applying car-care-products...in many diverse weather conditions.
If they don't seem or feel "quite right"...I, for one, cease application until
"conditions" improve. YMMV, though.
Bob