About this item

• Product Overview

  Resilient, durable anti-corrosion formula protects metal components, equipment and tools up to several years depending on application and environment. Displaces water. Dries to an amber, wax-like coating. Does not wear off easily. Protects metal from the effects of water, salt and high humidity.

  See the product data sheet for full details.

  Corrosion Inhibitor

  • Contains special rust and corrosion inhibitor additives
  • Protects against the effects of salt, moisture and chemical corrosion
  • Leaves a long-lasting (up to several years), protective, wax-like, amber coating
  • Sprays into hard-to-reach places and works as an undercoat
  • Ideal for steel, iron, aluminum, brass, copper and other metal surfaces

  See the product data sheet for full details.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  4.8 star rating

  Based on 78 reviews

  Based on 78 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    No rust
    By  DAN,  a  Verified Buyer  from  Ohio  on  March 19, 2026

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    Trying to keep some rust off. Time will tell. Easy to apply.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great Rust preventative
    By  STEVEN,  a  Verified Buyer  from  Massachusetts  on  March 13, 2026

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    This works fantastic on bare metal or over painted metal that is not rusted yet, but do not put it over metal that is already rusted. There are better products for that.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Metal protection
    By  MICHAEL,  a  Verified Buyer  from  Wisconsin   on  December 27, 2025

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    Great protection for metal underbody. Appears to stick well. Do not spray on engine as it has brown tint to it ...
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (1) NO (0)
  • 5 star rating
    Fantastic stuff
    By  JOHN,  a  Verified Buyer  from  Boston  on  December 07, 2025

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    Great product. Perfect combination of oil and wax. Nozzle stem is not a universal fit for all chassis spray hoses but careful study and an exacto knife may make for a usable fit.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 4 star rating
    HD metal protector
    By  NYDS,  a  Verified Buyer  from  Somewhere in the USA  on  October 19, 2025

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    Just sprayed it on. I will gladly give you a full review in about 4 months and let you know how it worked out.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (1) NO (0)
  • 5 star rating
    MP HD
    By  RON,  a  Verified Buyer  from  Kansas City   on  September 28, 2025

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    This is a great product I have used for years. Recently the cans have changed to a rounded top and the spray tips are not as deep for inserting the straws and they keep slipping out if you touch anything with the straw. It gets pretty messy. Without the straw they spray great. The straw really helps getting into small areas. Great product though!
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (3) NO (0)
  • 5 star rating
    heavy duty metal protector
    By  ED,  a  Verified Buyer  on  September 25, 2025

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    great stuff i use it for under coating my truck works great great company fast shipping
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (1) NO (0)
  • 5 star rating
    Undercoat
    By  JOSEPH,  a  Verified Buyer  from  USA northeast   on  September 06, 2025

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    Excellent product, medium liquid that penetrates nooks and crannies. Can spray right on rusted metal and it adheres nicely. Dry time is important, best to let sit for 48 hours depending on temperature and humidity. Drys to an excellent coating, does not wash off. Will probably need to recoat at some point depending on abuse.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    More than a lubricant
    By  GEORG,  a  Verified Buyer  from  Huntsville AL  on  August 01, 2025

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    I have used AMSOIL products since the early 1970s after being introduced to them by my neighbor. I have found that the MP Metal Protector is the go-to product not only to lubricate difficult nuts and bolts and auto parts but also to keep them working long after. Unlike other similarly advertised products, MP adds a long-lasting thin film over the metal parts to keep moisture out and allow for the parts to move properly. I have used it to loosen pistons on a seized engine to lubricating door locks and padlocks during the winter. One must give it enough time to penetrate, and then it will perform its magic. While I may use other synthetic oil brands for the crankcase, I would not like to be without the MP.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (1) NO (0)
  • 5 star rating
    Metal Protector
    By  Scrappy,  a  Verified Buyer  from  New Mexico  on  June 22, 2025

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    This stuff really works. Used on engine, fire pit, wheels, about everything I don't want to paint. So far it has stop even surface rust from forming. Gonna try it on headers, that will be the ultimate test. Stay tuned for an update.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (2) NO (0)

• Highlights

  • Contains special rust and corrosion inhibitor additives
  • Protects against the effects of salt, moisture and chemical corrosion
  • Leaves a long-lasting (up to several years), protective, wax-like, amber coating
  • Sprays into hard-to-reach places and works as an undercoat
  • Ideal for steel, iron, aluminum, brass, copper and other metal surfaces.
• Returns

  We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.

• Payments

  We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.

• Product Overview

  Resilient, durable anti-corrosion formula protects metal components, equipment and tools up to several years depending on application and environment. Displaces water. Dries to an amber, wax-like coating. Does not wear off easily. Protects metal from the effects of water, salt and high humidity.

  See the product data sheet for full details.

  Corrosion Inhibitor

  • Contains special rust and corrosion inhibitor additives
  • Protects against the effects of salt, moisture and chemical corrosion
  • Leaves a long-lasting (up to several years), protective, wax-like, amber coating
  • Sprays into hard-to-reach places and works as an undercoat
  • Ideal for steel, iron, aluminum, brass, copper and other metal surfaces

  See the product data sheet for full details.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  4.8 star rating

  Based on 78 reviews

  Based on 78 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    No rust
    By  DAN,  a  Verified Buyer  from  Ohio  on  March 19, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Trying to keep some rust off. Time will tell. Easy to apply.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great Rust preventative
    By  STEVEN,  a  Verified Buyer  from  Massachusetts  on  March 13, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This works fantastic on bare metal or over painted metal that is not rusted yet, but do not put it over metal that is already rusted. There are better products for that.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Metal protection
    By  MICHAEL,  a  Verified Buyer  from  Wisconsin   on  December 27, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great protection for metal underbody. Appears to stick well. Do not spray on engine as it has brown tint to it ...
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Fantastic stuff
    By  JOHN,  a  Verified Buyer  from  Boston  on  December 07, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great product. Perfect combination of oil and wax. Nozzle stem is not a universal fit for all chassis spray hoses but careful study and an exacto knife may make for a usable fit.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 4 star rating
    HD metal protector
    By  NYDS,  a  Verified Buyer  from  Somewhere in the USA  on  October 19, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Just sprayed it on. I will gladly give you a full review in about 4 months and let you know how it worked out.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    MP HD
    By  RON,  a  Verified Buyer  from  Kansas City   on  September 28, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This is a great product I have used for years. Recently the cans have changed to a rounded top and the spray tips are not as deep for inserting the straws and they keep slipping out if you touch anything with the straw. It gets pretty messy. Without the straw they spray great. The straw really helps getting into small areas. Great product though!
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (3) NO (0)
  • 5 star rating
    heavy duty metal protector
    By  ED,  a  Verified Buyer  on  September 25, 2025

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    great stuff i use it for under coating my truck works great great company fast shipping
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Undercoat
    By  JOSEPH,  a  Verified Buyer  from  USA northeast   on  September 06, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Excellent product, medium liquid that penetrates nooks and crannies. Can spray right on rusted metal and it adheres nicely. Dry time is important, best to let sit for 48 hours depending on temperature and humidity. Drys to an excellent coating, does not wash off. Will probably need to recoat at some point depending on abuse.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (2) NO (0)
  • 5 star rating
    More than a lubricant
    By  GEORG,  a  Verified Buyer  from  Huntsville AL  on  August 01, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have used AMSOIL products since the early 1970s after being introduced to them by my neighbor. I have found that the MP Metal Protector is the go-to product not only to lubricate difficult nuts and bolts and auto parts but also to keep them working long after. Unlike other similarly advertised products, MP adds a long-lasting thin film over the metal parts to keep moisture out and allow for the parts to move properly. I have used it to loosen pistons on a seized engine to lubricating door locks and padlocks during the winter. One must give it enough time to penetrate, and then it will perform its magic. While I may use other synthetic oil brands for the crankcase, I would not like to be without the MP.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Metal Protector
    By  Scrappy,  a  Verified Buyer  from  New Mexico  on  June 22, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This stuff really works. Used on engine, fire pit, wheels, about everything I don't want to paint. So far it has stop even surface rust from forming. Gonna try it on headers, that will be the ultimate test. Stay tuned for an update.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (2) NO (0)