I tried Zero Rust on my car yeaterday. Two hours later looked dry tried the fingernail torture test on some overspray. Came off. Today 24 hours later. tried it again. Still came off! The say 14-30 days for full cure. My concern is I am using it on the underside of my daily driver. I need something that cures a little quicker than 14 days. Hair dryer speed things up? It's been a little colder today (50's) then yesterday and raining. That affect it?