I'll ship out a sample can this week. You could spray it below 35 degrees without any problems. In the aerosol can it will just come out a bit heavier, but it will still spray. For your truck, I would recommend purchasing a gallon and use an undercoating gun or airless paint sprayer to apply. It leaves a wet, non-drying film, so you will get an initial dusting. You will not get any type of build-up, though, since Fluid Film never gets gummy or tacky. It remains very slick.
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