Why do so many more people seem to use and recommend pb blaster, compared to knock'er loose? is pb just hype or is kl actually better?

Its all opinion. But I am a 30 professional auto technician/shop owner and my opinion is KL or aerokroil is best. PB does great advertising.

does this work on cast iron?

Not sure what you are trying to do, but we use the Knocker loose for rusted and hard to remove fasteners from various types of material, if you are having an issue with a bolt or some sort of fastener that you are trying to remove this product works great for that aspect,,hope this helps

does this contain silicone? We are an auto body paint shop and must have silicone free

Contains petroleum distillates. Does not mention silicone on ingredient label.

Crc Knocker Loose Penetrating Solvent 13 Oz Aerosol Can Reddish

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2018698₫

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

FAST-ACTING RUST PENETRATION: Industrial-strength solvent rapidly penetrates rust, scale, and corrosion to help loosen stubborn seized nuts, bolts, hinges, and threaded components.
DUAL-ACTION FORMULA: Combines a penetrating solvent with long-lasting lubrication to help free frozen parts and continue protecting them from future rust and friction.
DISTINCTIVE REDDISH FORMULA: The visible red color makes it easy to see where you've applied the product, helping ensure thorough coverage on rusted parts.
VERSATILE INDUSTRIAL USE: Suitable for automotive, marine, agricultural, manufacturing, and home workshop applications — works on nuts, bolts, chains, hinges, and linkages.
13 OZ AEROSOL SPRAY: Precision spray delivery reaches tight, hard-to-access areas with controlled application, helping reduce waste and mess in professional and DIY settings.

CRC Knock’er Loose penetrates cracks, machine assemblies, frozen connections, and fittings to quickly dissolve rust, corrosion, grime, and grease. The 50-state compliant formula makes it easy to disassemble tools, automobile engines, plant machinery, and other equipment for routine maintenance. This industrial-grade penetrating solvent is NSF H2 registered for use in meat and poultry plants. It works effectively on various metal fittings, hinges, bushings, washers, lugs, nuts, bolts, metal joints, and couplings.

Specifications

Brand	CRC
Package Information	Tin
Liquid Volume	16 Fluid Ounces
Item Weight	1 Pounds
Recommended Uses For Product	General maintenance, loosening stuck parts, removing rust, cleaning
Flash Point	64 Degrees Celsius
Specific Uses For Product	Prevent Corrosion
Item Form	Spray
Global Trade Identification Number	00078254030203
UPC	078254030203
Item model number	03020
Product Dimensions	6.6 x 6.6 x 20.07 cm; 453.59 g
ASIN	B000LEVE00

Reviews

U**7

29.05.2024

L**R

21.04.2026

J**.

22.01.2026

W**?

24.04.2026

R**F

13.04.2026

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