Here are some facts about Kroil you may not know:

1. Superior Penetration: Kroil is specifically formulated to penetrate deeply into rust, corrosion, and seized parts, often working where WD-40 may not reach effectively.

2. Rust Dissolution: Kroil has strong rust-breaking capabilities that help loosen heavily corroded fasteners, while WD-40 primarily acts as a water displacer and light lubricant.

3. Longer-lasting Lubrication: Kroil provides long-lasting lubrication after penetration, reducing squeaks and ensuring smooth operation over time. WD-40's lubrication effect is typically temporary.

4. Specialized Formula: Kroil’s secret formulation is designed to remove rust and free stuck parts, making it more effective for heavy-duty rust and corrosion issues.

5. Less Evaporation: Kroil tends to stay on and penetrate longer, whereas WD-40 can evaporate faster, requiring more frequent re-application.

6. Wider Range of Applications: Kroil is preferred in industrial, automotive, and firearm maintenance due to its strong rust-dissolving and penetrating characteristics, whereas WD-40 is more of a water displacer and light lubricant.