Customer Ratings & Reviews

This is a great product that seems to have a lot of different uses. I use the heavy duty metal protector as a lasting lube for hiem joints and as an undercoating for my Jeep’s frame and underbody to protect against road salt in the winter. Great stuff.

You name it I've tried it when it comes to products that claim they prevent rust or stop rust and some are good don't get me wrong I'm talking major brand names to Independent chemical companies and I figured I'd give Amsoil a try and I literally put it on existing rust and it stopped the rust not for like a week or a month but permanently and I did the underneath of my Toyota 4Runner from front to back and is anybody knows in the Rust Belt most products don't hold up this not only holds up but I'm just sorry I didn't find it years ago Amsoil really is the best I admit this is the first product I've ever used from them but now that I've seen what this can do I'm going to try the other products too.

Great quality product that protects all of my wave runner’s operating systems and does not easily wear off.

I use this stuff on plow moldboards to keep them from rusting. It has many other uses around the farm

This stuff should be mandatory in this humid salty environment. It works great.

I spray this stuff on the underside of my mower decks - when brand new and or really scraped. It seems to minimize the amount of grass buildup and definitely minimizes rust. Great product - but wear gloves!

It works great used it for some garage items and parts around the house.

It soaks into the metal fast and takes the rusty look away..

All amsoils products are great , unfortunately prices have doubled in the last two years!

Having been using the entire range of Amsoil products for my vehicles and motors for a very long time. Purchased a new 23 Toyota Tundra recently and wanted to help protect the frame/components from the Northeast winter salt. Applied MPHD to the entire underside of the vehicle, simple process overall and when dried it created a nice barrier from all contaminants. Truck has been driven in snow/salted roads and after being washed all exposed metal still looks brand new, highly recommend this product.

I would recommend to anyone who wants to DIY rustproof their car, truck or anything else that will rust. Plus it goes a long way. I did my Yukon XL with less than 2 cans.

I wish I could write a review, but I tried the product and then wanted to spray it again on a different area and nothing would come out. I followed directions on the can and now I get nothing out of the can. It might work, but I will never know. Disappointed that the can failed. Will not buy again

Great product it works great for keeping rust off of my tools in my garage .also use it under my lawn mower decking to stop rust and to keep the grass from sticking I highly recommend this product

I’ve used this on my 2016 2020 Chevy duramax . With no rust! Spray entire under body no oxidization or rust. Putting on my 2022 I’m sold!! Also works great on bottom of mower deck!

Used this product to protect my equipment from harsh winter salt. The product holds up well from abuse of salt spray for the winter season.

Sprays easily and coats well. The straw is actually useable. I have used other brands while this one was unavailable and they suck. Can’t use the straws and more wax ends up on your finger tip then what you’re spraying. I use this product to coat the chassis and suspension on my trucks.

After debating whether to undercoat or use this product to protect frame rails and undercarriage, I am very happy that I listened to others reviews on this product. Turned out amazing, was easy to apply, and seems to be very long lasting after cured. Ordering more to have when needed.

damaged product container un-usable not first time won't purchase any more

HDMP has been a necessity in my shop for decades. It gets used as chain lube, protection from the elements on my little sawmill, hinge lube on every vehicle, on and on. Just a super useful product!

Works good