It might work but you'll need a bunch to spread around the car. One thing I've noticed about car events /shows are that people respect the old stuff much more than late model entries. I've done a lot of shows over the years from big NSRA and Goodguys shows to the mack daddy Autorama in Detroit many moons ago. I guess they think the old stuff has a lot of blood sweat and tears put into them from the owner (which many have) and the new stuff is just a washed up new car that is "just" a car that the owner bought and has no sweat into it. Pop up parking lot car shows attract a lot of non-car people that happen to just be in the area. Those are the worst to have poking around the cars.....