Brand · B'laster

Which PB B'laster should you buy?

The mechanic's choice, in three strengths of commitment.

B'laster is best known for the red-and-yellow can of PB B'laster Penetrating Catalyst, the penetrant mechanics reach for when WD-40 won't cut it. It is budget-priced, rated Very Deep for penetration, and it takes the rusted-bolt verdict in two of its three head-to-heads.

The range goes further than most people realize. The Industrial Strength formula steps up to Maximum penetration for heavy equipment and decades-old corrosion, and the Garage Door Lubricant is a different product entirely: a no-drip lube for tracks, springs and rollers, not a penetrant.

Pick by job

Which PB B'laster for which job

Rusted car bolts, exhaust and suspension
PB B'laster
Very Deep penetration at a budget price. The non-evaporating formula keeps working while it soaks.
Penetrating Oils · Very Deep · 11 oz · our score 96%
Check Price Review
Farm equipment, heavy machinery, the truly hopeless
B'laster Industrial
Steps up to Maximum penetration in a bigger 18 oz can, for when the regular can is not enough.
Penetrating Oils · Maximum · 18 oz · our score 94%
Check Price Review
A noisy garage door
B'laster Garage Door
Not a penetrant. A no-drip lube that clings to tracks, springs and rollers. Our top garage door pick.
Sprays · Light · 9.3 oz · our score 93%
Check Price Review

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Side by side

The PB B'laster lineup, specced

Product	Type	Penetration	Size	Price	Best for	Our score
PB B'laster	Penetrating Oils	Very Deep	11 oz	$	automotive repair, rusted exhaust bolts	96%
B'laster Industrial	Penetrating Oils	Maximum	18 oz	$$	industrial machinery, heavy equipment	94%
B'laster Garage Door	Sprays	Light	9.3 oz	$	garage door tracks, springs	93%

Head-to-Head

How PB B'laster does in a fight

WD-40 vs PB B'laster

PB B'laster penetrates deeper on seized bolts; WD-40 is the better all-rounder.

Read the head-to-head →

PB B'laster vs Kroil

Kroil penetrates deeper; PB B'laster offers 90% of the performance at half the price.

Read the head-to-head →

Liquid Wrench vs PB B'laster

PB B'laster for serious rust. Liquid Wrench for indoor and light-duty work.

Read the head-to-head →

Rankings

Where PB B'laster places in our best-of lists

Put it to work

Jobs we reach for PB B'laster on

Seized-part jobs where a PB B'laster can is one of our picks, and why.

How to Remove a Seized Brake Caliper Bolt

First pick

PB B'laster: Non-evaporating, so it keeps creeping into the threads while you wait. Built for exactly this kind of automotive rust.

Moderate · soak 30 min to overnight · heat with care

How to Loosen a Stuck Brake Bleeder Screw

PB B'laster: Stays wet on the fitting for a long soak instead of flashing off.

Moderate · soak several hours to overnight · no heat

How to Loosen a Rusted Brake Line Fitting

First pick

PB B'laster: The mechanic’s default for heavy automotive rust, and it stays where you put it.

Hard · soak overnight, reapplied · no heat

How to Remove a Brake Rotor Stuck to the Hub

First pick

PB B'laster: Creeps into the hub-to-rotor joint and keeps working while you swing the hammer.

Moderate · soak 15–30 min · no heat

How to Remove a Wheel Stuck to the Hub

First pick

PB B'laster: Gets into the pilot gap and keeps working while you work the wheel.

Easy · soak 15 min · no heat

How to Remove a Rusted Lug Nut

First pick

PB B'laster: Made for rusted automotive fasteners and stays wet on the stud.

Easy · soak 15–30 min · no heat

How to Remove a Rusted Exhaust Manifold Stud or Nut

PB B'laster: Non-evaporating, which matters on a multi-day soak.

Hard · soak 1–3 days, reapplied · heat ok

How to Remove a Seized O2 Sensor

First pick

PB B'laster: Specifically good on rusted exhaust fasteners, per our review.

Moderate · soak 30 min to overnight · heat with care

How to Remove a Seized Control Arm Bolt

First pick

PB B'laster: Listed for seized suspension in our review. Non-evaporating, so an overnight soak works.

Hard · soak overnight · heat with care

How to Remove a Sway Bar Link Nut When the Stud Spins

First pick

PB B'laster: The automotive-rust pick. Gets into the nut threads while you set up the holding tool.

Moderate · soak 15–30 min · heat with care

How to Remove a Shock or Strut Top Nut That Spins

First pick

PB B'laster: Listed for seized suspension. Soak it while you rig the holding tool.

Moderate · soak 15–30 min · no heat

How to Remove a Ball Mount Stuck in a Hitch Receiver

First pick

PB B'laster: Penetrant for heavy automotive corrosion. Stays put for a long soak.

Moderate · soak 30 min to overnight · heat with care

How to Remove a Stuck Bike Seatpost

PB B'laster: Stays wet for a multi-day soak.

Hard · soak 1–3 days, reapplied · no heat

How to Remove a Seized Bike Pedal

First pick

PB B'laster: Non-evaporating, good for a long soak on steel-in-aluminum threads.

Moderate · soak 30 min to overnight · no heat

How to Remove a Stuck Bottom Bracket

PB B'laster: Stays wet overnight on the cups.

Hard · soak overnight · no heat

How to Fix a Stuck or Seized Garage Door Roller

B'laster Garage Door: No-drip formula listed for rollers, hinges and tracks.

Easy · soak 10–15 min · no heat

How to Remove a Stuck Lawn Mower Blade Bolt

First pick

PB B'laster: Heavy-corrosion penetrant that stays on the bolt.

Easy · soak 15–30 min · heat with care

How to Remove a Rusted Carriage Bolt That Spins

First pick

PB B'laster: Stays in the threads while you set up to hold the head.

Moderate · soak 15–30 min · heat with care

How to Loosen a Stuck Threaded Pipe Union

First pick

PB B'laster: Penetrant for heavy corrosion. Stays put on overhead pipe.

Moderate · soak 30 min to overnight · no heat

Asked and answered

PB B'laster questions

Is PB B'laster better than WD-40?

For seized bolts, yes. Our head-to-head: PB B'laster penetrates deeper on seized bolts; WD-40 is the better all-rounder. If you have one stuck fastener, reach for PB. If you need one can that does everything, WD-40 wins.

PB B'laster or Kroil?

Kroil penetrates deeper; PB B'laster offers most of the performance at about half the price. Use PB for daily work and save Kroil for the impossible jobs.

What is the difference between PB B'laster and B'laster Industrial Strength?

We rate the regular Penetrating Catalyst Very Deep and the Industrial Strength formula Maximum. Industrial is mid-priced and comes in an 18 oz can; it is aimed at heavy equipment and extreme corrosion rather than everyday car work.

Can I use PB B'laster on a garage door?

Use B'laster's dedicated Garage Door Lubricant instead. A penetrant is built to creep into rusted threads, not to stay on a track. The garage door formula is made to cling to tracks, springs and rollers without dripping.

Playing the field