Do not, whatever you do, get it on your hands, bloody awful stuff to shift off skin if you do use it. However I wouldn't on the car, it is good gear but after bonding some stone, which is a use for it, late last year it has now failed, and I reckon it's because rain has got to it over time, personally I wouldn't trust it on the front of a car.
You can get a caulking gun tube of 'Stixall' which I have used around a leaking soil pipe, on roof tiles, bonded plastic exterior trim, gutter repairs etc and it is far better imo as you can even apply it in the wet, and it stands wet, much better. Also gorilla glue goes off in the bottle after a few months, goes hard and brittle.
Just my opinion.