CRC Evapo-Rust is a best-seller for many reasons.
In this article, we answer these questions:
- What's your opinion about the product?
- Does the CRC Evapo-Rust really work?
- How does it work?
- How much do I need to use?
- Do I need to fully submerge the whole item, or just the rusted surfaces?
- Will it corrode the rusted metal and other non-metal components?
- How long do I need to soak the rusted metal in it?
- Do I need to sand or scrub the rusted item after soaking it in?
- Can I reuse the liquid solution?
- Is it flammable?
- Is it harmful, hazardous and toxic?
- Feedback from users in real-life applications
Disclaimer: The information compiled here is based on actual experience and diligent research. Nevertheless, it should not be treated as professional advice. As always, read the label and proceed with caution.
CRC Evapo-Rust — Quick Use Guide
CRC Evapo-Rust is a water-based, non-acidic rust remover that uses selective chelation to remove iron oxide without damaging base metal, paint, plastic, or rubber. Reusable until exhausted. Working time depends on rust severity — light surface rust in 30 minutes, heavy rust may need overnight soak.
| Step | Action |
|---|---|
| 1 | Clean part — remove loose rust, grease, and oil |
| 2 | Submerge part fully in Evapo-Rust |
| 3 | Soak 30 minutes (light rust) to overnight (heavy rust) |
| 4 | Remove, rinse with water, dry thoroughly |
| 5 | Apply protective coating to prevent flash rust |
What's your opinion about the product?
One Friday afternoon, our Sales Manager, Sam, soaked a bunch of rusted sprockets in Evapo-Rust solution. He took photos of the progress of what happened after soaking them (1) after two hours and (2) over the weekend.
Does the CRC Evapo-Rust really work?
The quick answer is a yes. It effectively removes even deep rust on all types of mild steels and iron. Deeply rusted parts (5 mm or deeper) may require overnight soaking. Evapo-Rust can be used over and over until performance drops off.
How does it work?
EVAPO-RUST works through selective chelation — a process where a large synthetic molecule bonds to iron exclusively, removing it from iron oxide (rust) while leaving base metal intact. The iron is then pulled away by a sulfur-bearing organic molecule, freeing the chelator to continue working.
How much do I need to use?
Use the liquid solution pure and undiluted. The amount depends on how many items you are de-rusting and how badly rusted they are. Sam used a 5-litre container to fully submerge around 100 kilograms of sprockets of various sizes.
Do I need to fully submerge the whole item, or just the rusted surfaces?
You only need to submerge the rusted areas. If the whole item is badly rusted all over, submerge it completely.
Will it corrode the rusted metal and other non-metal components?
EVAPO-RUST is safe to use on aluminium, brass, copper, non-oxide-based paints, plastics, PVCs, rubber, and vinyl.
How long do I need to soak the rusted metal in it?
That depends on how badly rusted parts are. Light surface rust clears in 30 minutes. Heavily rusted parts may need overnight soaking or longer.
Do I need to sand or scrub the rusted item after soaking it in?
Not always. Sam had to lightly brush off a few sprockets to achieve the desired result, but most came off visibly rust-free after thorough wiping.
Can I reuse the liquid solution?
Yes. You can reuse the solution until the performance drops off. When ready to dispose of spent solution, in most cases it can be safely put down the drain.
Is it flammable?
It is non-caustic, non-flammable and contains no flammable materials. Keep it away from obvious heat sources and open flames as a standard precaution.
Is it harmful, hazardous and toxic?
According to the safety data sheets, it is not classified as hazardous per Safe Work Australia criteria. It contains no acids, hazardous air pollutants (HAPs) or volatile organic compounds (VOCs). It has no food safety certification, but can be used on parts of food equipment as long as it does not directly contact food.
People Also Ask — Does the CRC Evapo-Rust Really Work
Q: How does Evapo-Rust work to remove rust?
Evapo-Rust uses selective chelation — a process where chelating agents bond to iron oxide (rust) molecules and hold them in solution, lifting them off the base metal without attacking the underlying iron or steel. It is water-based, non-toxic, non-flammable, and biodegradable. Unlike acid-based rust removers, it does not etch bare metal, making it safer for use on precision parts.
Q: How long should I soak parts in Evapo-Rust?
Light rust (surface oxidation): 30 minutes to 2 hours. Moderate rust: 4–8 hours. Heavy rust with pitting: overnight or up to 24 hours. Agitation (brushing or sloshing every hour) speeds up the process. Parts must be fully submerged. The solution turns dark brown as it absorbs rust — it can be reused until it stops working effectively (typically after removing approximately 300 g of rust per litre).
Q: What is the best CRC product for long-term rust protection?
For long-term storage protection, CRC SP-400 or CRC Dry Film PTFE provide durable barrier protection. For active corrosion prevention in wet or marine environments, CRC SP-350 (a heavy wax-based inhibitor) is preferred. CRC 2-26 is excellent for moisture displacement and contact protection but provides limited long-term film durability — apply monthly in harsh environments.
Q: Can I use Evapo-Rust on chrome or aluminium parts?
Evapo-Rust is safe on steel and iron and will not damage chrome plating, aluminium, copper, brass, solder, or most plastics during normal soak times (up to 24 hours). However, it is not effective at removing rust from aluminium — aluminium forms aluminium oxide, not iron oxide, and the chelating agents in Evapo-Rust are selective to iron. For aluminium oxidation, use an aluminium-specific cleaner.
