I used it in my car and there is a odor for about a week or two during hot weather. But I have had the car on the road for four years now and no smell after the couple of weeks.
I put it on the inside of the roof, I am now installing a sunroof in the car and have the headliner back out. Non of it fell down but I won't say it stuck well either on the roof. If I were to use it again on the roof I would use spray adhesive to help it stick.
Dave