Does coating the underside of deck really work?

Over the last few years, just for fun, I have treated the underside of several mower decks (including brand new never used) with several of the sprays and a few of the brush-on deck coatings. I have prepped older decks by scraping and scrubbing them clean and I have coated a brand new deck before its first use. And all of the results were short lived. I could get a couple of mowings with no build up and sometime just slight build up but after 4 or 5 mowings it is always completely gone. That doesn't mean it's a total waste of time. If you it helps and you have the time to spare ...go ahead. But it will need re-coating pretty quickly. It definitely helps with deck build-up and helps keep the deck from clogging but not for very long. The big benefit is ease of scraping the build-up after mowing. It is probably not worth it considering the time and effort required but since I have a MoJack lift, this year I may keep a can of the spray around and after one of my cleanings just give a quick spray to assist the next clean up. The applications help keep the wet grass from sticking but I have concluded that I need to scrap anyway. I saw no difference from spray coatings and brush-on coatings or from brand to brand. If someone has been successful with a coating, please share as we ALL would love to hear about it.
 
The issue isn't how well the coatings work and they do work. The issue is how to prevent the sandblasting from the grass, dust, dirt, rocks, and sand that immediately start eroding off the coating as soon as the blades are engaged.
 
Users just don't understand how abrasive grass is. When I service office equipment the customers just could not understand how paper could wear a piece of metal out. You slide enough of it across anything it will wear. It just like how water itself can wear though stones.

I would think of us in the service have experienced impacts from near invisible grit hitting our skin and eyes. I even had to have a piece removed from my right eye surface that a magnifier to see. It felt like a grain of sand.
 
POR 15 chassis coat will stand up to the abrasion
Man bullets bounce off that stuff when fully cured
However it HAS to be done properly which takes a very long time to do
 
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