KROIL Original Penetrant Aerosol is a time-tested penetrating oil in a convenient 13 oz spray can, designed to tackle the jobs that freeze up your work. Whether you're dealing with rusted fasteners, corroded machinery, or stuck components in tight spaces, this aerosol formulation reaches where brush-on oils can't—into threads, crevices, and narrow gaps. Since 1939, KROIL has been the go-to choice for gunsmiths, mechanics, hunters, and DIYers who refuse to let corrosion win. If you're cleaning a seized bolt on your rifle, freeing a stuck pulley on equipment, or fighting rust on legacy guns and gear, KROIL gets in, loosens the corrosion, and leaves a protective film behind.
The aerosol delivery is no gimmick—it's practical. You can direct the spray exactly where you need it, making it ideal for field repairs and bench work on firearms and outdoor gear. KROIL doesn't just free frozen parts; it also displaces moisture and prevents flash rust, so your freshly freed components stay corrosion-free. The formula is made in the U.S.A. and meets VOC compliance across all 50 states, so it works everywhere.
This is the original formula trusted by professionals and experienced hands-on users for over 80 years. Keep a can in your cleaning kit, gunroom, tackle box, or truck. When something won't move and you need it to, KROIL is the answer.
Key Features
- 13 oz aerosol spray for precision application in tight spaces and hard-to-reach areas
- Penetrates rust, corrosion, and frozen fasteners quickly and thoroughly
- Displaces moisture and provides corrosion prevention after loosening
- Made in the U.S.A.; 50-State VOC compliant
- Trusted formula with 80+ years of field-proven performance
Specifications
| Brand | Kano Labs |
| Product Type | Penetrating Oil Aerosol |
| Size | 13 oz |
| Compliance | 50-State VOC Compliant; NSF Nonfood Compounds Program Listed (H2 Category, for applicable sizes) |
| Made In | U.S.A. (portions of packaging imported) |
Frequently Asked Questions
What is KROIL penetrating oil used for?
KROIL is a penetrating oil formulated to free rusted or corroded fasteners, shafts, pulleys, and seized components. It's commonly used by shooters for stuck bolts on firearms, by mechanics for stubborn hardware, and by anyone working with outdoor gear or vintage equipment exposed to the elements.
Can KROIL reach into tight spaces and small openings?
Yes. The 13 oz aerosol spray design allows you to direct the penetrant precisely into threads, crevices, and narrow gaps where brush-applied oils cannot easily reach. This makes it especially useful for detailed firearm maintenance and intricate mechanical work.
Does KROIL prevent rust after it frees up a part?
Yes. Beyond loosening corrosion, KROIL displaces moisture and leaves a protective film that helps prevent flash rust and further corrosion on freshly freed components.
Is this formula compliant for use everywhere in the U.S.?
KROIL Original Penetrant is 50-State VOC compliant, meaning it meets emissions standards across all U.S. states.
