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CRC SP-400 Corrosion Inhibitor

Curated from 88 real Reddit conversations

Refreshed on: March 4, 2025

CRC SP-400 Corrosion Inhibitor

Brand: CRC

Price: $19

Snoop Score:

8.7

Sentiment

7.7

Popularity

8.6

Technical

9.0

Buy on Amazon for $19 See All Corrosion & Rust Inhibitors Reviews

As an Amazon Associate, I earn from qualifying purchases.

Snoop's Take

The CRC SP-400 Corrosion Inhibitor is a powerful aerosol spray designed to provide long-term protection against rust and corrosion on all bare metals. With its firm and waxy film, it seals out moisture completely, making it ideal for equipment exposed to harsh outdoor conditions, humidity, and chemicals. Consumers have praised the effectiveness of this product, with many stating it is "one of the best performing rust inhibitors you can buy." Feedback highlights its ability to offer long-term protection, as users have reported that surfaces treated years ago remain rust-free. Additionally, the product is noted for its versatility, being effective for protecting metal hardware and vehicles alike, as reflected in comments such as "rust is cancer" and "it looks brand new, living in New England rust zone." Based on the overwhelmingly positive user experiences shared through various feedback themes, the CRC SP-400 Corrosion Inhibitor is highly recommended for anyone seeking reliable protection against rust and corrosion in a variety of applications.

Not for you? Check out our other rated Corrosion & Rust Inhibitors

This is one of the best performing rust inhibitors you can buy, and far exceeds the likes of Boeshield and CRC since this works outside in exposed environments.
Positive Feedback

Especially for electronics which might get humid/wet. Spray down and just send it.
Negative Feedback

8.7

CRC SP-400 Corrosion Inhibitor

Buy on Amazon for $19

Preventative Maintenance

9 / 10

Marine Applications

9 / 10

Automotive Protection

9 / 10

Industrial Use

9 / 10

See how this compares to all Corrosion & Rust Inhibitors

What it does well!

Key strengths users can’t stop talking about.

Best performing rust inhibitor

“This is one of the best performing rust inhibitors you can buy, and far exceeds the likes of Boeshield and CRC since this works outside in exposed environments.”➕

Effective long-term protection against rust

“This is some good shit.”➕

“It was still fine years later.”➕

Effective long-term corrosion protection

“I used PB surface shield before and it seems to work well.”➕

“hopefully it slows what is already there, and prevents what would have been.”➕

Effective corrosion protection

“I’ve been using CRC CORROSION INHIBITOR! 6 Cans for $55.”➕

Positive user experience with CRC product

“This video sold me on CRC.”➕

“Right now I'm pretty happy with CRC 3-36. It's thick enough to last a while without getting to the point of being nasty to use.”➕

Effective for protecting metal hardware

“Even with washing the hardware it still turned slight rust in some spots and I added a rust protection.”➕

“I don’t ever wash my kayaks I don’t even spray them down with water, all I do is use crc on the prop and that’s it.”➕

“What can I do? Desiccant packets? Dehumidifier? Air condition the garage?”➕

Effective for coating vehicles

“Rust is cancer.”➕

Highly effective corrosion protection

“I did it last fall and looks brand new, living in New England rust zone.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.

Alternative products may outperform for some applications

“Especially for electronics which might get humid/wet. Spray down and just send it.”➕

Concern about trapping moisture when not properly prepped

“At least someone give me a good $20k-$30k and I could find out for myself 😂”➕

“I would be afraid of it trapping moisture, unless properly prepped.”➕

May not be the best solution for all

“It will still rust if you do this and over the lifetime of the vehicle, all those extra underbody washes get expensive.”➕

Concern about washing may remove rust inhibitors

“I’d recommend skipping the soap. It may be removing the rust inhibiting products.”➕

Concerns about compatibility with rubber or plastic seals

“I’d wonder if it would attack and rubber or plastic like seals or bushings?”➕

Compare On All Talked About Dimensions

Product Name	Price	Score	See Details	Buy Now
CorrosionX Heavy Duty Rust Prevention Spray	$26	10.0	Details	Buy
CRC 06026 Heavy Duty Corrosion Inhibitor	$13	9.7	Details	Buy
CRC SP-400 Corrosion Inhibitor	$19	8.7	Details	Buy
Boeshield T-9 Rust & Corrosion Protection	$21	8.3	Details	Buy
STA-BIL Rust Stopper Anti-Corrosion Spray	$12	8.0	Details	Buy
Boeshield BOESHIELD T-9 Rust & Corrosion Protection/Inhibitor	$7	7.5	Details	Buy
RustKote - Rust Fighter Aerosol	$14	7.5	Details	Buy
CRC Heavy Duty Marine Corrosion Inhibitor, 10 oz.	$17	7.2	Details	Buy
WD-40 Specialist Corrosion Inhibitor Spray	$15	6.7	Details	Buy
Fluid Film Powerful Rust & Corrosion Protection Spray	$23	6.7	Details	Buy
KROIL Kroil Original Penetrating Oil 10oz Can	$20	6.3	Details	Buy
KROIL Original Penetrating Oil 13oz Can Case of 6	$151	5.8	Details	Buy
Wuiil Fluid Film Lubricant/Corrosion Inhibitor, 11.75 oz.	$9	5.6	Details	Buy
Fluid Film Rust & Corrosion Protection Spray - 6 Pack	$60	5.5	Details	Buy
CorrosionX Corrosion Technologies 90102 Multi-Purpose Lubricant	$27	5.5	Details	Buy
Rust-Oleum 224284 Stops Rust Rust Inhibitor Spray	$14	2.6	Details	Buy
soikoi CRC 06026 Heavy Duty Corrosion Inhibitor	$56	1.7	Details	Buy
Quicksilver Corrosion Guard Engine Protect Rust Inhibitor	$12	1.7	Details	Buy
Strikehold Marine - 12oz Spray Lubricant	$19	1.6	Details	Buy
Webetop Rust Prevention Spray, 15.2 OZ	$19	1.4	Details	Buy
Eazy2hD Rust Converter for Metal, 1 Quart	$24	1.1	Details	Buy

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.

Discussion about alternative rust prevention methods

“I’m gonna give it a shot. People have given it good reviews.”➕

“Surface shield seems like it came out on top as well as CRC and rust cutter.”➕

General discussion about rust prevention methods in marine environments

“I hope I'm not posting in the wrong sub. Any advice or suggestions would be greatly appreciated!”➕

“Salt water eats everything.”➕

“My dude EVERY boat with electrical systems has a zinc sacrificial anode.”➕

“A light coating of a thin oil does wonders, but requires weekly refreshing and can make a mess.”➕

General discussion about oil for rust prevention

“What's a good oil to use to prevent rust on hand tools? What the title said”➕

“Just about any mineral oil. The purpose is to separate the metal from the atmospheric oxygen. You do”➕

“CRC 3-36 won in this testing: https://www.finewoodworking.com/2012/05/31/the-best-rust-preventers”➕

“I use it for everything.”➕

Discussion on high heat corrosion inhibitors.

“Wet high heat corrosion inhibitor that won't burn off.”➕

“Thanks for posting on /r/MechanicAdvice! Please review the [rules](https://www.reddit.com/r/Mechani”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’

Comparison with other rust inhibitors

“Fine Woodworking did a comparison test some years ago, and found CRC 3-36 performed better.”➕

General discussion about various rust inhibitors

“It's 50F and raining here in Northern Wisconsin right now, and the humidity is so high it's nearly raining in my unheated shop.”➕

“I absolutely love this stuff, it has a nice smell too.”➕

“Then this is your jam.”➕

“Sta-bil Rust Stopper, Fluid Film, Break Free CLP, or some other corrosion inhibitor oil.”➕

Discussion on rust prevention methods

“CRC Marine Corrosion Inhibitor is a step above Fluid Film if you want to go the oil based route.”➕

“My Jeep does its own "rust prevention" by getting oil leaks often enough that the whole bottom side has a thin coating of oil.”➕

“Hit it with a rust bond primer then paint.”➕

“Clean the rust off with steel wool then wipe a thin coat of oil on them.”➕

Discussion about the effectiveness of different undercoating methods

“Is there a safe coating I can spray under my vehicle and is it even necessary?”➕

“DO NOT GET A RUBBERIZED PAINT LIKE UNDERCOATING. It will trap moisture under it and rot your frame underneath.”➕

“any oil/fluid based undercoating is great.”➕

“Works well.”➕

Discussion about alternatives like Fluid Film and Corban-35

“I’m sick of doing even routine things on my own vehicles because I’ve had them undercoated with fluid film, it’s disgusting.”➕

“I’m an AMT for the Coast Guard and we spray it on everything.”➕

Discussion about care and maintenance for kayaks

“It is straightforward to use for gear, probably going to put it in a spray bottle.”➕

“I’d just give it a real good rinse.”➕

Discussion on rust levels in different states

“It slightly boils my blood to see people from rust free states posting pics like this all concerned.”➕

“I’m in New York, I just wash once a week when it snows.”➕

“New York definitely isnt a rust free state though.”➕

“You should see mine from the salt in Chicago during Winter… I wish mine was this nice lol.”➕

Discussion on application techniques for corrosion inhibitors

“Spotless after 4 years.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.

Discussion about various rust protection methods

“Take care of it.”➕

“This is the way to protect your investment.”➕

“Finally learned about it and it is working well.”➕

“My 2007 is rust free in Nebraska due to Lanolin.”➕

Inquiry about vehicle safety precautions during application

“Don't really like to mess with a 'high voltage ' cable without a guaranteed lockout.”➕

Question about manufacturing fixes for hybrids

“Just bought a 2024 and wondering if they made a fix in manufacturing at any point.”➕