hydrocub
Its been at least 2 years on the one deck. I am happy with how it has held up.

I sprayed the underbody spray (rubberized coating on my 48" deck about 5 or 6 years ago and it has held up nicely, but Diz Jr.'s solution (and others) is one that I wish I had used, but I didn't consider it (not even for sure if it was on the market then ???) at the time....wish that I had!!

Cub Cadet 123

Do some of you guy's remember ZeiBart undercoating from the mid
70's ? It was good stuff until water got under it . Then it seemed to hide
rust until it was too late . That was my only concern with a liner type
coating ( I understand bedliner is a different product ) . I will agree
with Matt of it being one tough environment for any product used .

Diz , sounds like you're happy with it ....What brand did you use ?

I'm also into wheeling and jeeps. Spray on bedliner has many uses for off-roading and has held up nicely. Most jeepers remove their carpet to find a lot of rust. most wire brush the rust, prime and then use spray on bedliner. It hold up well to moisture.

A few have also painted the exterior of their jeeps with spray on bedliner. It takes a beating from branches, rocks, mud, ect. Holds up great.

epoxy primer ,my dad primed a gas tank with it and the the guy who he did it for it, went and had it acid dipped the primer still didn't come off. So for some reason I don't think grass going to hurt it.

He said he also used on his cub cadet 149

Epoxy primer will abrade off just like any other paint product. The bedliner is probably the only thing that stands a chance. It's too bad they don't make a 'smooth' formulation of it for things like this.

Seems I read where somebody used POR 15 to repair a rusted deck pan. I would think POR 15 might be a good solution. From what I read, you still have to top-coat it with something, but I think that's just for U/V protection. I doubt that would be a problem on the underside of a mowing deck. If applied properly, it kills rust, prevents it from recurring, and takes any kind of abuse in stride - at least that's what the literature says. It also has a slick, epoxy-like finish, rather than the rough, textured bed liner finish.

If anybody has used POR 15, please speak up. I tried searching, but couldn't find anything, but I'm sure I read a post about it last year.

I have used POR-15 numerous times. It does dry super hard. 80 grit paper on a orbital will barely take it off. The top coats are mostly for UV protection. They have a newer product called hardnose topcoat. I have only done a couple minutes worth of reading on it, but it might be something to look at.

I painted my dads car trailer about 6-7 years ago with POR, and didn't ever get around to top coating it. It sits outside in the sun year round. The POR will turn flat black, but that is about it.

The POR-15 is good stuff, almost impervious to anything. Its pretty thin & watery in consistancy so it does take the texture of the surface its being applied too. If its applied to a dimply or bumpy surface, the POR-15 won't be very smooth on the first coat. After a couple of coats it smooths out nice, even with a bumpy surface underneath.