B'laster
PB B'laster Penetrating Catalyst
The mechanic's choice. Penetrates deeper. Stays longer.
by B'laster
PB B'laster is the penetrant mechanics reach for when WD-40 won't cut it. Its non-evaporating formula creeps into rusted threads and stays there, working its way deeper over time. Some say it's better than the original. We say try both.
PB B'laster has earned its cult following in shops across America for one reason: it doesn't stop until the job is finished. The non-evaporating formula clings to vertical surfaces and continues working its way deeper over hours, making it ideal for an overnight soak on badly seized fasteners. Its aggressive petroleum solvent base attacks oxidation at a molecular level, though the intensity of the experience — particularly the aroma — isn't for the faint of heart.
What We Like
- + Legendary break-free power — loosens things other penetrants can't budge
- + Non-evaporating formula stays wet and active longer between applications
- + Budget-friendly so you can use it liberally without guilt
- + Petroleum-based solvent attacks rust and corrosion aggressively
What Could Be Better
- − Extremely pungent — the whole garage will know what you've been up to
- − Leaves an oily residue that demands cleanup after every session
- − Not safe on some plastics and painted surfaces — know your materials before going in
Who Should Buy This
The seasoned mechanic who's dealt with the worst rust has to offer and needs something with serious staying power. If you've been frustrated by penetrants that quit before the job is done, PB B'laster goes the distance.
Best For
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See This Product In
WD-40 vs PB B'laster
PB B'laster penetrates deeper on seized bolts; WD-40 is the better all-rounder.
Head-to-HeadPB B'laster vs Kroil
Kroil penetrates deeper; PB B'laster offers 90% of the performance at half the price.
Head-to-HeadLiquid Wrench vs PB B'laster
PB B'laster for serious rust. Liquid Wrench for indoor and light-duty work.
Best-OfBest Penetrating Oil
Our top picks for penetrating oils in 2026. We tested WD-40, PB Blaster, Kroil, and more to find the ones that go deepest.
GuideHow to Free a Seized Bolt
Step-by-step guide to freeing seized, rusted, or frozen bolts using penetrating oil. The right technique makes all the difference.
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