Maybe this isn't the right section for this but it seems kind of appropriate here.

There are a ton of different brands of undercoating out there and I don't know what's good. 3M is usually good, but there are lots of other companies that specialize in the stuff. I'm looking for a rubbery type undercoating similar to that's stuff put on at the factory.

I've got a Pathfinder that I cut the wheel wells out of and enlarged so it's all bare steel. The undercoating should give it all a finished look and help with rust prevention.

Most of them are sold as aerosol and non. I have a compressor but not a lot of spraying equipment...are the non aerosol products better or just cheaper?