Workshop

Best Lubricant for Rusted / Seized Bolts

Looking for the right lubricant for your rusted / seized bolts? We compared 3 options for this use case — including common searches like frozen bolt, stuck bolt, seized nut, corroded bolt, rusty screw. Here's what works and what to avoid.

PB B'laster Penetrating Catalyst

Oil Base: Blend Viscosity: Ultra-thin Form: Aerosol Spray

Industry standard for seized fasteners. Creeps into threads and dissolves rust bonds.

Best for Frozen/rusted bolts, seized parts, corroded threads, stuck fasteners
Avoid Not a long-term lubricant — evaporates. Follow up with proper oil or grease
For this use Spray, wait 15+ min. Repeat for severe rust.
Amazon ↗
$ USA Manufacturer ↗

Liquid Wrench Penetrating Oil

Oil Base: Blend Viscosity: Ultra-thin Form: Aerosol Spray

Fast-acting penetrant with cerflon additive for extra rust-busting power.

Best for Rusted nuts & bolts, frozen locks, corroded plumbing fittings, stuck valves
Avoid Not a long-term lubricant; evaporates after use
For this use Fast-acting alternative with cerflon
Amazon ↗
$ USA Manufacturer ↗

Kano Kroil Penetrating Oil

Oil Base: Blend Viscosity: Ultra-thin Form: Aerosol Spray

Premium penetrant favored by machinists. Creeps through 0.0000001-inch gaps.

Best for Severely seized fasteners, antique restoration, gunsmithing, precision instruments
Avoid Expensive for general use; not a lasting lubricant
For this use Premium choice for severely seized fasteners
Amazon ↗
$$$ USA Manufacturer ↗

Other Workshop Fixes

See the full lubricant guide →