Can i use liquid wrench penetrating oil on a large pvc water shut off valve? it runs to a waterfall. it has been buried for years and won't budge.

It should not hurt the pvc. If valve has been buried, I would first clear around it then clean it as best as possible. Take a hair dryer or heat gun(be very careful with heat gun) and warm, just warm valve, let cool and warm again. Apply liquid wrench let sit 10-20 mins. Use valve wrench to try and open valve, repeat id necessary. Heat done right(low) ought not cause any problems with liquid wrench which is a flammable.

After it dries, does anyone knows if it will prevent rust?

It does prevent rust. Been using liquid wrench for 40 years to prevent rust on my tools stored in my garage. After iI use a metal tool I spray it with Liquid Wrench. Never lost a tool due to rust.

Is it safe to use for breaking loose rusted stuck exhaust bolts? i know it is flammable but i figure i could clean it off after i get the bolts out.

It won a comparison between 5 other well known rust penetrators by a well know product evaluator on YouTube. But the ultimate exhaust bolt fix is heat if all else fails.

Does this form a foam when sprayed on ??? J. Payne

No, it is more like the consistency of WD-40. It bubble a little when you first spray it (probably from the propellant) but it leaves more of a thin (penetrating) oil residue.

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Liquid Wrench L112/4-4PK Penetrating Oil with Cerflon - 11 oz., (Case of 4) by Liquid Wrench

Product ID: 637607793

Details

Brand
Liquid Wrench
Item weight
311 Grams
Liquid volume
11 Fluid
Material
Plastic
Package information
Bottle

⚙️Fast-acting rust dissolver

🛡️Safe on painted & plastic surfaces

🇺🇸100% Made in USA, 50-state compliant

Description

🛠️ Break free from rust, stay ahead of the grind!

BULK UP YOUR TOOLBOX - Case of 4 x 11 oz. cans ensures you’re always ready to tackle any frozen mechanism or rusty fitting.
PROTECT WHAT MATTERS - Low odor, zero VOC, and safe on painted surfaces, plastics, and PVC—engineered for your delicate gear.
ECO CONSCIOUS COMPLIANT - 50-state VOC compliant and proudly made in the USA—performance without compromise.
TRUSTED LEGACY OF EXCELLENCE - Backed by 75+ years of family-owned innovation and reliability, favored by pros and DIYers alike.
UNLOCK STUBBORN RUST IN SECONDS - Powerful Cerflon formula penetrates and frees stuck nuts, bolts, and locks with unmatched speed.

Liquid Wrench L112/4-4PK Penetrating Oil with Cerflon is a fast-acting, anti-seize spray designed to dissolve rust and free stuck nuts, bolts, and locks. This low-odor, zero VOC formula is safe on painted surfaces, plastics, and PVC, making it ideal for a wide range of applications. Packaged as a convenient case of four 11 oz. cans, it’s 50-state compliant and proudly made in the USA by a trusted family-owned company with over 75 years of expertise.

Specifications

ASIN	B00J5LZ5KA
Brand Name	Liquid Wrench
Container Type	Bottle
Customer Reviews	4.6 4.6 out of 5 stars (101)
Global Trade Identification Number	10078698217762
Item Form	Oil,Liquid,Spray
Item Weight	311 Grams
Liquid Volume	11 Fluid Ounces
Manufacturer	Liquid Wrench
Material	Plastic
Model Number	L112/4-4PK
Number of Items	4
Part Number	L112/4
Recommended Uses For Product	Automotive, Rusty components, Frozen mechanisms
Specific Uses For Product	Prevent Corrosion
Unit Count	1301.2353 millilitre

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