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expireddavid3808 posted Jan 12, 2022 06:05 PM
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expireddavid3808 posted Jan 12, 2022 06:05 PM

15-Ounce Rust-Oleum Rubberized Undercoating Spray (Black)

$4.50

$11

59% off
Amazon
44 Comments 52,417 Views
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Deal Details
Amazon has 15-Ounce Rust-Oleum Rubberized Undercoating Spray (Black) on sale for $4.47. Shipping is free w/ Prime or on $25+ orders.

Thanks to Community Member david3808 for posting this deal.

About this Product:
  • Perfect for use on bare or primed metal underbodies of cars, trucks, trailers, RVs and more
  • Professional-grade formula provides superior protection against corrosion and damage from water, salt and other chemicals
  • Dries to the touch in 1 hour and covers up to 10-15 sq. ft. per can
  • Undercoating helps deaden sound and reduce damage to parts
  • Features a wide, comfort spray tip and any-angle spray technology for easy painting even upside down

Editor's Notes

Written by SaltyOne | Staff
  • About this Deal:
    • Well Rated with 4.7 out of 5 stars from over 4,800 reviews.
    • At the time of this posting, Our research indicates that this is $2.50 lower (35.9% savings) than the next best available prices for like-products with prices starting from $6.97. -SaltyOne
  • About this Store:

Original Post

Written by david3808
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has 15-Ounce Rust-Oleum Rubberized Undercoating Spray (Black) on sale for $4.47. Shipping is free w/ Prime or on $25+ orders.

Thanks to Community Member david3808 for posting this deal.

About this Product:
  • Perfect for use on bare or primed metal underbodies of cars, trucks, trailers, RVs and more
  • Professional-grade formula provides superior protection against corrosion and damage from water, salt and other chemicals
  • Dries to the touch in 1 hour and covers up to 10-15 sq. ft. per can
  • Undercoating helps deaden sound and reduce damage to parts
  • Features a wide, comfort spray tip and any-angle spray technology for easy painting even upside down

Editor's Notes

Written by SaltyOne | Staff
  • About this Deal:
    • Well Rated with 4.7 out of 5 stars from over 4,800 reviews.
    • At the time of this posting, Our research indicates that this is $2.50 lower (35.9% savings) than the next best available prices for like-products with prices starting from $6.97. -SaltyOne
  • About this Store:

Original Post

Written by david3808

Community Voting

Deal Score
+46
Good Deal
Visit Amazon

Price Intelligence

Model: Rust-Oleum Automotive Flat/Matte Black Professional Grade Undercoating 15 oz

Deal History 

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Sort: Lowest to Highest | Last Updated 9/17/2025, 10:12 PM
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Top Comments

JonnyAbs
521 Posts
618 Reputation
I've heard from rust belt mechanics that it causes more harm than good
GrosseIleRobin
19 Posts
10 Reputation
I use this with great success for waterproofing outdoor low voltage landscape wiring connections.
zoome
86 Posts
57 Reputation
I would not use this under the body of your vehicle. If you're looking into some underbody rust prevention, I would suggest something like Fluid Film.

43 Comments

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Jan 15, 2022 05:17 AM
521 Posts
Joined Mar 2018
JonnyAbsJan 15, 2022 05:17 AM
521 Posts

Our community has rated this post as helpful. If you agree, why not thank JonnyAbs

I've heard from rust belt mechanics that it causes more harm than good
1
1
Jan 15, 2022 06:19 AM
345 Posts
Joined Feb 2011
CheapestDealzJan 15, 2022 06:19 AM
345 Posts
Quote :
Quote from JonnyAbs :
I've heard from rust belt mechanics that it causes more harm than good
JonnyAbsI've heard from rust belt mechanics that it causes more harm than good
Correct, it might trap moisture between the metal and the rubber which speed up the rusting. But this is a good deal. Buying 2 for DIY projects.
Last edited by CheapestDealz January 14, 2022 at 10:23 PM.
2
Jan 15, 2022 07:58 AM
426 Posts
Joined Jun 2015
gyrfalcon16Jan 15, 2022 07:58 AM
426 Posts
if this crap has a valid application I haven't found it yet. multiple cans available if you pay shipping...
2
8
Jan 15, 2022 12:19 PM
259 Posts
Joined Mar 2007
flassh81Jan 15, 2022 12:19 PM
259 Posts
Quote from CheapestDealz :
Correct, it might trap moisture between the metal and the rubber which speed up the rusting. But this is a good deal. Buying 2 for DIY projects.
Based on the og post, it seems priming the bare metal first before using this is how it achieves protection. I've never even heard of this stuff but wondering if mechanics are seeing it used as the only cost without a primer vs proper use.
Jan 15, 2022 01:14 PM
19 Posts
Joined Aug 2013
GrosseIleSquealJan 15, 2022 01:14 PM
19 Posts
I use this with great success for waterproofing outdoor low voltage landscape wiring connections.
Jan 15, 2022 02:00 PM
86 Posts
Joined Mar 2012
zoomeJan 15, 2022 02:00 PM
86 Posts
I would not use this under the body of your vehicle. If you're looking into some underbody rust prevention, I would suggest something like Fluid Film.
1
Jan 15, 2022 02:45 PM
1,877 Posts
Joined Jan 2008
BigbanksJan 15, 2022 02:45 PM
1,877 Posts
I use fluid film. I do not live in the rust belt. If you use this stuff, clean and prep the area first. Clean up rust, prime, hit with this.

If your car is new, no rust, putting this on would be okay.
1

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Jan 15, 2022 03:26 PM
490 Posts
Joined Jan 2008
dandiditJan 15, 2022 03:26 PM
490 Posts
If you are serious, use something with rust inhibitors in it:
https://www.amazon.com/Automotive...215&sr=8-2
Jan 15, 2022 03:54 PM
1,953 Posts
Joined Nov 2014
Mark42mcJan 15, 2022 03:54 PM
1,953 Posts
Quote from CheapestDealz :
Correct, it might trap moisture between the metal and the rubber which speed up the rusting. But this is a good deal. Buying 2 for DIY projects.
I heard the trick was to make sure you prime first then spray the rubber application to the other side and it won't cause any further issues if you just spray it without priming then you're trapping moisture or taking a chance to
Jan 15, 2022 04:28 PM
345 Posts
Joined Feb 2011
CheapestDealzJan 15, 2022 04:28 PM
345 Posts
Quote from Mark42mc :
I heard the trick was to make sure you prime first then spray the rubber application to the other side and it won't cause any further issues if you just spray it without priming then you're trapping moisture or taking a chance to
Thanks that makes more sense.
Jan 15, 2022 04:28 PM
156 Posts
Joined Mar 2010
jimglassfordJan 15, 2022 04:28 PM
156 Posts
This crap lasts about 2 months on a surface before it dries and flakes off. That is the same for any of the spray undercoatings. In order to get it to spray out of a nozzle, it is thin and aerated to the point where all you have is a porous coating. Its only use is to cover the rust on a car while you try to sell it. If it were free, I would not use it.
1
Jan 15, 2022 07:55 PM
1,290 Posts
Joined Aug 2014
Firstlast236Jan 15, 2022 07:55 PM
1,290 Posts
What's with the terrible shipping dates? Feb 23rd!
1
Jan 15, 2022 09:35 PM
341 Posts
Joined Jan 2015
theskater101388Jan 15, 2022 09:35 PM
341 Posts
Quote from Bigbanks :
I use fluid film. I do not live in the rust belt. If you use this stuff, clean and prep the area first. Clean up rust, prime, hit with this.

If your car is new, no rust, putting this on would be okay.
Got a gallon of this stuff just waiting for my new truck to come in to use it on. Read/seen a lot of great things about FF, can't wait to try it!
1
2
Jan 16, 2022 12:06 AM
87 Posts
Joined Nov 2020
RightnitroJan 16, 2022 12:06 AM
87 Posts
Quote from CheapestDealz :
Correct, it might trap moisture between the metal and the rubber which speed up the rusting. But this is a good deal. Buying 2 for DIY projects.
Please tell me you're joking. The first comment was a good joke. Your comment is plainly false. Any 'moisture' under this application, would not do anything being so miniscule.
6

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Jan 16, 2022 03:36 AM
1,356 Posts
Joined Apr 2015
dasein56Jan 16, 2022 03:36 AM
1,356 Posts
Any uses other than automotive?
1

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