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#4755283 - 05/12/18 07:13 PM Anti rust coating for new mower deck
Oldtom Offline

Registered: 07/05/14
Posts: 356
Loc: Cecil County Maryland
My 10 year old Murray mower deck just broke in half from rust. The engine is running fine so I gave the whole thing to a local small engine guy/tinkerer. Maybe he can salvage the engine and mount it on another deck. Mowers rust out rather than wear out for me. Is there anything I can spray or brush on the underside of a new mower deck to resist rust? I thought of Fluid Film or wheel bearing grease, but thought it would be scoured off by the grass. Would spray undercoating or roof cement give a wear resistant surface?

Thanks in advance for any advice.

#4755297 - 05/12/18 07:31 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
PimTac Offline

Registered: 03/04/17
Posts: 4950
Loc: Soviet State of Washington
Keeping the underside clean is probably the best way and if rust appears then hit it with some Rustoleum
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Valvoline Advanced Synthetic 0w20
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#4755298 - 05/12/18 07:32 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
Ducked Offline

Registered: 10/25/12
Posts: 4473
Loc: Taiwan
For regular treatment, motor oil, perhaps mixed with diesel if you want to spray it (smelly though), or kerosene.

For longer term, Sunflower oil if you are not at all in a hurry. (off season?)
Boiled linseed Oil if you are still not in a hurry but don't have unlimited time.

Gets very sticky while its going off though. If you use it in that state I think a lot of grass might stick to it and be a pain to remove.

Once rust forms add a bit more veg oil and rub it in with aluminium foil, say at the end of the season. Builds up a good protective coating.

Edited by Ducked (05/12/18 07:36 PM)

#4755299 - 05/12/18 07:34 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
MParr Offline

Registered: 10/28/17
Posts: 569
Loc: Georgia
The best thing to do is keep it clean. Rinse underneath with water after use. The accumulation of wet grass will do a number on a mower deck. After you rinse spay the business side of the deck with WD40 or another spray lubricant of your choice. This thin film of oil will help keep the clippings from sticking to the deck and it will be easier to rinse off.
2013 KIA Optima EX 2.4L. Now: Castrol Magnatec GTX 5W30 synthetic & STP S2808ML
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#4755314 - 05/12/18 07:49 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
Rand Offline

Registered: 08/20/03
Posts: 12818
Loc: NE,Ohio
no coating will hold up. get an aluminum,magnesium, or plastic deck
2019 Jeep Cherokee Trailhawk 2.0T

#4755326 - 05/12/18 08:03 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
Snagglefoot Offline

Registered: 12/31/17
Posts: 2083
Loc: SE British Columbia, Canada
WD 40 Specialist Long Term Corrosion Inhbitor or perhaps PAM for an environmentally suitable solution?

#4755339 - 05/12/18 08:17 PM Re: Anti rust coating for new mower deck [Re: Rand]
spasm3 Offline

Registered: 05/30/10
Posts: 8884
Loc: North Carolina
Originally Posted By: Rand
no coating will hold up. get an aluminum,magnesium, or plastic deck

Or thicker steel.

I've not found anything that holds up.. Even graphite paint.
13 elantra 70k 5w30 QSUD
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#4755343 - 05/12/18 08:20 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
JHZR2 Offline

Registered: 12/14/02
Posts: 41979
Loc: New Jersey
Do you store it outdoors?

I don't clean the deck regularly. I had the mower exposed for oil change and blade sharpening last weekend, and noticed there's starting to be a bit of surface rust when I removed the grass. It's still got many years left.

I plan to do a bit of cleaning now and again and apply FF when I think of it.

#4755347 - 05/12/18 08:26 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
ddtmoto Offline

Registered: 12/20/09
Posts: 287
Loc: Utah
POR-15, pretty tuff stuff
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ram 5.9
'09 GTZ1400 Concours

#4755367 - 05/12/18 08:48 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
MasterSolenoid Offline

Registered: 09/26/17
Posts: 200
Loc: One Step Beyond
I just bought my first ever Riding Mower.
I will most likely over-maintain it like other stuff I own (1977 Ariens Snow-Thrower).

I used it for the 1st time today.
When I got done, I took the garden hose and blasted off all grass under the deck.
A strong stream of water really removes the grass.

They do sell jacks to raise the front of a riding mower so you can clean under them better.
Tomorrow I'm going to try jacking up the front with my hydraulic floor-jack (used for vehicle).
As long as it's SAFE to jack up, I can clean the deck alot better.

I figure if I can thourghly clean off the grass with a garden hose, I'll have a good chance
of keeping the deck rust-free

Oiling the deck in the Fall before putting away would be good.

#4755382 - 05/12/18 09:06 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
JLawrence08648 Offline

Registered: 01/20/17
Posts: 276
Loc: NJ
I have a 48" walk behind I bought used. I grinder wire brushed the bottom, Rustoleum oil prime the bottom, then Rustoleum oil paint. Cut my small lawn, 30'x50', takes 3 minutes, after 5-8 cuts, the paint is gone. If you think of paint then think of POR-15, it is suppose to be super tough.

#4755429 - 05/12/18 09:46 PM Re: Anti rust coating for new mower deck [Re: ddtmoto]
buck91 Offline

Registered: 04/17/12
Posts: 2511
Loc: West Michigan
Originally Posted By: ddtmoto
POR-15, pretty tuff stuff

I treated a heavily rusted machete blade with POR-15 and tis held up fantastic! It should last a good, long time on a mower deck.
2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop

#4755432 - 05/12/18 09:49 PM Re: Anti rust coating for new mower deck [Re: Oldtom]
Michael_P Offline

Registered: 08/20/07
Posts: 1791
Loc: .
I dont know if you fertilize or not, but fertilizer is the arch enemy of mower decks, including non ferrous metal decks. Cut before you fertilize. Make sure the fertilizer had soaked in before next cut. Cut only dry grass.

#4755543 - 05/13/18 04:32 AM Re: Anti rust coating for new mower deck [Re: Oldtom]
Char Baby Offline

Registered: 05/25/05
Posts: 10189
After I scrape & clean and garden hose the underneath of my mower deck, I paint the undercarriage with used oil. I dip a brush in the pan of used oil and slap/slop it on. Once I'm done swatching on the oil, I run the engine for a few minutes.

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#4755560 - 05/13/18 05:26 AM Re: Anti rust coating for new mower deck [Re: Oldtom]
Lubener Offline

Registered: 01/22/11
Posts: 2670
Loc: N.Ohio
Amsoil makes a good spray on rust inhibitor. Its waxy coating might last a couple years and you would have to clean it up and reapply. Rustoleum on a new deck will work too.Hosing the underside immediately after mowing is paramount and help the mulching abilities. Avoid used oil as that will attract and cause grass to build up creating a huge mess.
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