I had a THOROUGH application of Krown on a west coast 84 K5 Blazer, and as I reported in a previous post, it did ZERO to protect the inner fenders and "wash" areas. It seems like way too thin or light oil. I recently found Fluid Film, and used 5 gallons on two RUST FREE Suburbans. It has a consistency like jam, and I'll report on how it holds out.
I did the application myself, using the air powered gun supplied with the $220US kit.
Pictured are my 2 Suburbans, an '84 From San Francisco, and a '95 I just drove back from Phoenix 2 months ago, and the supplied 360d sprayer from Fluid Film.