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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🛠️ Rust doesn’t stand a chance—unlock your projects with Liquid Wrench!

ECO FRIENDLY SAFE - Low odor, zero VOC formula that's safe on painted surfaces, plastic, and PVC.
VERSATILE HEAVY DUTY USE - Perfect for clamps, pipe fittings, hinges, frozen mechanisms, and more.
TRUSTED LEGACY OF 75 YEARS - Crafted by a family-owned brand trusted by pros and DIYers alike.
UNLOCK STUBBORN RUST INSTANTLY - Penetrates and frees stuck nuts, bolts, and locks with ease.
BULK PACK FOR CONTINUOUS PROJECTS - 12 bottles of 11 oz each to keep your toolkit stocked and ready.

Liquid Wrench L112-12PK Penetrating Oil is a powerful, low-odor formula designed to dissolve rust and free stuck hardware. Made in the USA by a trusted family-owned company with over 75 years of expertise, this 12-pack of 11-ounce bottles is safe on painted surfaces, plastic, and PVC, and compliant with all 50 states’ regulations—ideal for professionals and DIYers who demand reliable, eco-conscious performance.

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Material	Plastic
Brand	Liquid Wrench
Package Information	Bottle
Liquid Volume	11 Fluid Ounces
Item Weight	15.39 ounces
Recommended Uses For Product	Penetrating Oil
Item Form	Oil
Global Trade Identification Number	00078698408804
Manufacturer	Liquid Wrench
Unit Count	132.0 Ounce
UPC	078698408804
Number of Items	12
Model	L112-CS-12PK
Item Weight	15.4 ounces
Product Dimensions	10.9 x 8.4 x 8.8 inches
Item model number	L112-12PK
Is Discontinued By Manufacturer	No
Manufacturer Part Number	L112-12PK

Liquid Wrench L112-12PK Penetrating Oil (12/11Oz)

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