Sems rust preventor?

[barbee6043]

I went into the pro paint store after Body Schultz undercoating. the guy pulls out this not realizing I wanted UNDERCOATING! and I didn't notice! I understand this rust preventor is designed to use like inside doors, etc. just wondering if anyone has had experience with it???? I have several cars i'm working on, and I can see using it inside the doors, where I normally do nothing, but should!!

 

[Woods74]

That rustoleum bedliner works tits too. Thin it out a little and spray it through a pressure pot with a 1/8 hose and a black irrigation garden watering nozzle found at home depot, they are tiny but work well.