3M Scotch 1633 Rust Remover

Identify seized or rust-affected fasteners. Locate bolts, nuts, or other fasteners showing rust, corrosion, or signs of seizing.

Ensure adequate ventilation. Work in well-ventilated areas or outdoors; the aerosol produces vapours requiring air circulation.

Shake the canister thoroughly. Mix the contents by shaking vigorously for 15–20 seconds to ensure uniform propellant and active ingredient distribution.

Apply directly to rust and fastener area. Spray the rust remover directly onto the corroded fastener, allowing the spray to saturate the rust and surrounding area from approximately 15–20 cm distance.

Allow penetration dwell time. Let the rust remover penetrate the rust for 15–30 minutes for moderate rust, or several hours for heavy corrosion. Longer dwell times improve effectiveness.

Reapply if necessary. For particularly stubborn seizure, reapply the spray and allow additional dwell time.

Apply gentle mechanical action. Once adequate dwell time has passed, apply gentle rotational force to the seized fastener using appropriately sized wrenches or socket tools.

Avoid excessive force. If the bolt does not loosen with moderate force, allow additional dwell time and reapply before using excessive force that risks fastener breakage.

Progress to full removal. Once initial movement is achieved, gradually increase rotation and mechanical leverage to fully release the fastener.

Clean surrounding area. Once the fastener is removed, wipe away excess rust remover and any remaining rust debris with a clean cloth.

Apply fresh coat for protection. For fasteners that will remain in place, apply a light coat of Scotch 1633 to protect against future rust and seizing.

Allow protective film to form. Let the protective coating cure for 5–10 minutes before operating equipment or applying load to fasteners.

Product Type Multi-purpose rust remover and lubricant spray

Format Aerosol spray canister

Container Size 400 mL (13.5 fl oz)

Chemical Composition Mineral oil with molybdenum sulfide

Product Colour Transparent

Primary Function Rust loosening and fastener release

Secondary Functions Moisture protection, oxidation prevention, lubrication

Application Method Direct spray from 15–20 cm distance

Penetration Depth High—reaches deep into rust and corrosion

Dwell Time 15–30 minutes for moderate rust; several hours for heavy corrosion

Application Thickness Depends on rust severity and fastener size

Fastener Compatibility All metal fasteners (bolts, nuts, studs, hinges)

Rust Target Types Surface rust, heavy corrosion, seized fasteners, long-term oxidation

Lubrication Properties Functions as general-purpose lubricant beyond rust applications

Protective Film Forms after rust removal, preventing renewed corrosion

Safety Profile Requires ventilation and protective equipment; mineral oil-based

Storage Temperature 10–27°C with <75% relative humidity

Shelf Life 2 years with proper storage

Not Approved For Potable water applications

Coverage Area Depends on application; typically 400 mL serves multiple fastener treatments

HS Code 3402.20

• Safety Data Sheet