
AMSOIL Signature Series Synthetic 0W-30 Motor Oil
May 27, 2015AMSOIL Miracle Wash Waterless Wash and Wax Spray
June 5, 2015AMSOIL Heavy Duty Metal Protector MPHD
AMSOIL Heavy Duty Metal Protector has been reformulated to provide improved performance as a corrosion inhibitor. MPHD is an easy to use spray-on product that effectively protects metal surfaces that are exposed to the damaging effects of salt, moisture or chemical corrosion. While still providing some lubricating properties, its primary focus is corrosion protection. It is the product of choice for metal surfaces that are exposed to the damaging effects of salt, moisture or chemical corrosion. AMSOIL Heavy Duty Metal Protector is also excellent for undercoating car doors, wheelwells, rocker panels seams and other metal surfaces exposed to water, dirt or road salt.
Heavy Duty Metal Protector
MPHD is an easy-to-use spray-on product that effectively protects metal surfaces that are exposed to the damaging effects of salt, moisture or chemical corrosion.
Excellent for automotive and trailer undercoat, spare tire carriers, battery terminals, tailgate hinges, handheld tools, snow plows, mower decks and blades, snowblowers, skid-steer attachments, farm machinery, fork lifts, metal gates and fences, and much more.
Package sizes include:
- 15-oz. Spray Can
**NOT AVAILABLE IN CANADA
- Contains additives that specifically protect against corrosion
- Displaces water and seals equipment from water intrusion
- Leaves a dry, long-lasting (up to several years), wax-like film
- Sprays into hard-to-reach places
- Helps protect against rust & corrosion, even in salt water
- Resists dirt
- Excellent long-term protection against corrosion

The three aluminum pieces in the upper left were treated with Heavy-Duty Metal Protector on their lower halves, while the three aluminum pieces in the upper right were untreated. The three steel pieces in the lower left were treated with Heavy-Duty Metal Protector on their lower halves, while the three steel pieces in the lower right were untreated. Following treatment, the pieces were placed in a 5 percent saltwater bath (the same salt and a similar solution to what vehicles and equipment are exposed to on winter roadways) for one hour, removed and allowed to dry for 23 hours. This process was repeated for 10 days. As seen in the pictures, the portions treated with Heavy-Duty Metal Protector show no signs of corrosion.
Applications
Automotive and trailer undercoat, spare tire carriers, battery terminals, tailgate hinges, handheld tools, snow plows, mower decks and blades, snowblowers, skid-steer attachments, farm machinery, fork lifts, metal gates/fences and much more.
Directions
Shake well before use. Clean target area prior to application. Apply in a uniform and even manner. For precision application, use extension straw. Allow to dry for two hours. For best results, allow to cure for 12 hours. Use AMSOIL Heavy-Duty Degreaser to remove overspray.
Shielding Metal Parts From the Elements
As an authorized AMSOIL dealer, we know how harsh the environment can be on exposed metal. Whether it’s outdoor storage, marine equipment, or tools on a job site, metal surfaces need reliable protection. That’s why we trust AMSOIL Metal Protector and MPHD Heavy-Duty Metal Protector for corrosion control that lasts.
Trusted Corrosion Protection
MP is a versatile solution that provides a light protective coating. It works well on locks, hinges, hand tools, and other metal parts where you want protection without buildup. MP displaces water, fights rust, and leaves a clean finish. It’s a go-to option for everyday applications where metal surfaces need a quick shield from moisture.
MPHD, or Metal Protector HD, is the heavy-duty version. It forms a thicker, wax-like coating that clings to metal. Ideal for equipment stored outdoors or exposed to salt water, MPHD offers long-term corrosion protection, even in brutal conditions. We’ve seen it used on trailers, boat components, agricultural equipment, and exposed structural steel. Its durability makes it a strong choice for off-season storage or extended downtime.
Practical Uses in the Field
Here’s where our customers often put MPHD to work:
- Marine gear: Outboard motors, winches, and mounts benefit from protection against salt spray.
- Farm equipment: Tools and attachments left in the field stay rust-free through wet weather.
- Construction tools: Job boxes and tools resist corrosion even when left outside.
- Seasonal vehicles: Trailers, plows, and ATVs stay protected while idle.
Both MP and MPHD deliver dependable results. If you’re dealing with moisture, salt, or long-term outdoor exposure, a high-quality corrosion protection coating makes a difference. AMSOIL’s products help customers keep their gear in working order, season after season.
Availability
AMSOIL Heavy-Duty Metal Protector is available in 15-oz. spray cans.
AMSOIL PRODUCT WARRANTY
AMSOIL products are backed by a Limited Liability Warranty.
HEALTH AND SAFETY STATEMENT
This product is not expected to cause health concerns when used for the intended applications and according to the recommendations in the Safety Data Sheet (SDS). Keep Out of Reach of Children. Recycle used oil and bottle.






