AMSOIL MP Metal Protector
AMSOIL MP Metal Protector (AMP) is a high-performance spray-on aerosol that lubricates moving parts, penetrates rust to free seized components, displaces freshwater and saltwater moisture from metal surfaces and helps protect against corrosion. One can does the work of a penetrating oil, light lubricant, water displacer and rust preventive, and the formula is also the choice for drying and protecting electrical and ignition systems.
Penetrates rust to free seized fasteners
MP Metal Protector penetrates deep through rust and corrosion to restore movement to parts that have been chemically locked together. A direct application onto rusted nuts, bolts, hinges, linkages, threaded sleeves and frozen mechanisms allows the carrier to wick into the corroded interface so the bond can be broken with hand tools instead of heat or destructive removal. The aerosol delivery is built for the kind of stuck hardware that resists ordinary lubricants and the kind of confined geometry where a brush, dropper, or oil can cannot reach.
Displaces water and helps prevent corrosion in fresh and salt environments
Once sprayed, the formula displaces freshwater and saltwater moisture from metal surfaces and the film carrier evaporates, leaving a corrosion-resistant film in place. This lift-and-protect action is what makes MP a maintenance fixture for marine hardware, outdoor power equipment, trailers, mower decks, fishing tackle, snowblowers, and any tool that lives in a damp shop, garage, or boat locker.
Treating exposed metal after washdown, after a saltwater run, or before seasonal storage adds a thin protective barrier that shields the underlying surface against the next round of moisture exposure. The film is designed to stay put rather than wipe away on contact, so the protection continues to work between maintenance cycles.
Lubricates moving parts and stops squeaks without gumming up mechanisms
MP Metal Protector effectively lubricates moving parts and silences squeaks without leaving the heavy, sticky residue typical of waxy rust preventives or grease-based aerosols. Pivots, hinges, latches, locks, cable ends, sliding mechanisms and trailer ramp pins benefit from a quick coat that frees binding without attracting dust the way thicker lubricants do. The formula keeps articulation smooth on equipment that is used intermittently and stored between sessions.
Dries and protects electrical and ignition systems
MP Metal Protector is the formula of choice for drying and protecting electrical and ignition systems. A light, controlled spray clears moisture from distributor caps, ignition wires, plug boots, connectors, terminal blocks, and outdoor electrical hardware that has been exposed to rain, splash, or washdown. Power to the equipment must be disconnected before spraying, and the residual film helps resist re-corrosion of the contact surfaces after drying.
Silicone-free formula compatible with non-metal surfaces
The formula contains no silicone, so it does not interfere with paint adhesion or refinishing the way silicone-bearing aerosols can. Compatibility extends to plastic, leather, fabric, fishing line and paint, which is why MP is a common choice for tackle, reels, line guides, vinyl trim, leather seats, and stitched gear that sits near tools, hardware, or outdoor metal. The aerosol pattern reaches into hard-to-reach places that a brush, rag, or grease tip cannot.
Recommended applications and service intervals
MP Metal Protector is intended as a multi-purpose maintenance aerosol for automotive, marine, powersports, equipment, shop, and household use. The right approach is a quick test spray on a hidden area when the surface is unfamiliar, then targeted application on the components that need the most help.
- Penetration and freeing of rusted bolts, nuts, hinges, linkages, locks, and other seized fasteners.
- Water displacement and corrosion protection on tools, firearms, fishing tackle, marine hardware, trailers, snowblowers, mowers, and other outdoor equipment.
- Light lubrication of moving parts, including pivots, latches, sliding mechanisms, and cables.
- Drying and protection of electrical and ignition systems, with the power source disconnected before spraying.
For best results, shake the can well before use, spray onto the area to be treated and do not wipe off so the film carrier can evaporate and leave the protective film in place. Aerosols may have different disposal requirements than other shop wastes, so empty containers should be disposed of in accordance with all federal, state, provincial, and local regulations. AMSOIL MP Metal Protector is backed by the AMSOIL Limited Warranty.
Order AMSOIL MP Metal Protector
AMSOIL MP Metal Protector is stocked in the 4-oz. spray can (product code AMP4SC) and the 8.75-oz. spray can (AMPSC), with the 8.75-oz. size offered as an each (AMPSC-EA) or as a case of twelve (AMPSC-CA). The 8.75-oz. spray can is also available in Canada under stock code CMP. The AMSOIL vehicle lookup guide helps confirm the right lubricants and filters for the same vehicle, equipment or marine application, and the full AMSOIL product catalog covers related cleaners, protectants, fuel additives, and shop supplies. Order AMSOIL MP Metal Protector in the size that matches the intended job.
Customer reviews
Works great
Way better than the others, this stuff works great!
By Michael from Upstate New York on July 07, 2026.
Would recommend this to a friend.
Excellent Rust Protection
Takes care of the rust and keeps my vehicle looking new.
By Cedric on June 05, 2026.
Would recommend this to a friend.
Good off-season rust protection in the off-season!
I use the MP Metal Protector on exposed metal surfaces of my off-season impliments. Works to my satisfaction!
By Moonshine455 from Vermont on May 18, 2026.
Read all 105 reviews
Frequently asked questions
What is AMSOIL MP Metal Protector used for?
AMP is a multi-purpose aerosol that performs four jobs from one can. It penetrates rust to free seized fasteners, lubricates moving parts and stops squeaks without gumming up mechanisms, displaces freshwater and saltwater moisture from metal surfaces and leaves a corrosion-resistant film. Common uses include rusted hardware, hinges and locks, marine and fishing gear, firearms, electrical and ignition components, and shop tools that need light lubrication and ongoing rust protection.
How does MP Metal Protector compare to WD-40 as a penetrating oil?
Both products ship in an aerosol can and both displace moisture, but MP Metal Protector is engineered as a longer-term metal protectant in addition to its penetrating and lubricating roles. The formula penetrates deep through rust to restore movement, then leaves a corrosion-resistant film that stays in place after the carrier evaporates so the treated metal continues to receive protection between maintenance intervals.
How long should MP Metal Protector sit before working a rusted bolt?
Best practice is to spray a generous coat directly onto the rusted joint, let the carrier wick into the corroded interface for several minutes and then attempt removal with hand tools. Heavily corroded fasteners may benefit from a second application and additional dwell time. The spray should not be wiped off between attempts, since the residual film continues to penetrate and lubricate as the joint is worked free.
Is MP Metal Protector safe on plastic, paint, and other non-metal surfaces?
The formula contains no silicone and is compatible with plastic, leather, fabric, fishing line, and paint. That makes MP suitable for treating metal hardware that sits next to painted bodywork, vinyl trim, plastic housings, fishing tackle and stitched gear without the bonding or refinishing problems that silicone-bearing aerosols can introduce. A quick test spray on a hidden area is still recommended for unfamiliar finishes.
Can MP Metal Protector be used on electrical and ignition equipment?
Drying and protecting electrical and ignition systems is one of the formula's primary applications. Power to the equipment must be disconnected before spraying. Once the carrier evaporates, the residual film helps resist corrosion of contact surfaces, terminal blocks, and ignition hardware that has been exposed to rain, splash, washdown, or condensation.
What sizes does AMSOIL MP Metal Protector come in?
AMP is available in a 4-oz. spray can (AMP4SC) and an 8.75-oz. spray can (AMPSC), with the 8.75-oz. size offered as an each (AMPSC-EA) or a case of twelve (AMPSC-CA). The 8.75-oz. spray can ships in Canada under stock code CMP. AMSOIL MP Metal Protector is backed by the AMSOIL Limited Warranty.