Metal Rescue™ Rust Remover Bath of the Workshop Hero™ line of products is a rust remover designed for iron and steel. It is non-toxic, easy to use and easy to clean up and dispose of. Metal Rescue™ is has a water-based formula that literally acts like a magnet to rust. We like to say “Metal Rescue™ is safe on everything except rust,” because while it removes rust from metal it will not harm other materials such as wood, glass, rubber, vinyl or plastic.
Metal Rescue™ is clean, safe, easy to use and is reuseable. Our website hosts a list of Frequently Asked Questions (the link is: http://www.metalrescue.com/consumerfaq.aspx) and I think the information below best addresses questions regarding Metal Rescue shelf life and how to determine whether your Metal Rescue™ is still effective and the product’s reusability. If I have misinterpreted your question and you are asking about Metal Rescue’s disposal method, I have provided details about that below as well:
What is the shelf life of Metal Rescue™?
Metal Rescue™ has an infinite shelf life (for un-opened product). Once opened, the shelf life of the solution will vary due to biodegradability. After using Metal Rescue™, it is best to cover the bath, but still allow air to flow over the surface. Used solution that is poured back into a sealed container will allow anaerobic bacteria to begin the degradation process. Open baths that are covered to prevent too much evaporation will continue to operate effectively for up to 12 months.
What is the Metal Rescue™ Use Life and is it Re-usable?
One gallon of Metal Rescue™ will remove approximately a ½ pound of dry rust, that is equivalent to removing rust from approximately 300 pounds of moderately rusted steel. Metal Rescue™ is re-usable, simply store product according to storage recommendations above. If any of the Metal Rescue™ solution evaporates, simply replace it with fresh tap water to original level. Once opened, Metal Rescue™ is good for one year.
How do I know when Metal Rescue™’s de-rusting capabilities are used up?
The bath will turn completely black and rust removal rates significantly decrease. The specific gravity will change from 1.02 to 1.06.
What is the proper disposal method for Metal Rescue™?
Metal Rescue contains no VOCs, solvents, acids or other hazardous ingredients. Spent (used) Metal Rescue is biodegradable and in most locations directly sewerable unless hazardous waste (certain oils, paints, heavy metals, etc.) is introduced into the solution. It is recommended to check local and federal disposal requirements.
Please note, following the steps highlighted below will help to ensure that users of Metal Rescue™ receive successful results:
** Metal Rescue™ Rust Remover Bath works best at room temperature or warmer. Any cooler temperatures may not produce the optimal results you are looking for. **
1) Soak. Immerse metal part in liquid until rust is removed. Do not leave part in liquid after rust is no longer present or metal might gray slightly.
2) Check. Check periodically. Immersion ranges from 5 min – 24 hrs depending on the rust. Do not leave part in solution longer than 24 hrs.
3) Rinse. Remove part and rinse with water or with clean Metal Rescue™ solution and dry thoroughly.