Wax based is the way to go and they are right this stuff stays on for years
Initial impressions: A lot easier to apply than other undercoats I have worked with. It goes a long way. 1/4 of the gallon was all I used to coat the steel components of my F150. I used a sponge brush for all but a few places where spraying was need to treat a hard to reach area. Cleans up easy. I am hopeful I will still feel this is a five star rating after a year or theee on the road.
I had a concern because I had some over spray after treating my 2014 GMC Pick-up. I was instructed by PSC that it should come off with a little mineral spirits. I ended up using odorless mineral spirits from my local hardware store and it worked perfect. Thank You PSC!
I'm just going to say I spent a long time trying to find a product that was not rubber undercoat. Instead that was oil-based. Because I wanted it to stay flexible and resist corrosion. I applied undercoating in a can and it went on excellent. with minimal overspray. This is my first time using undercoating in a can so I don't know how it will hold up. It's reasonably priced and if it's stands the test of time I will definitely reorder it to undercoat my truck again. I purchased the gallons worth and was able to spray two coats under my Chevy Tahoe. I would definitely recommend this to anyone looking for an oil based undercoat!