Woolwax Hard-On Permanent Rust Coating for Trucks & Equipment

Permanent Hard-Shell, Water-Based Rust Coating

Hard-On by Woolwax is a high-performance, water-based, permanent (non-removable) hard shell coating for truck frames and equipment. Originally developed as a chip guard for trailer trucks, it’s perfect for long-term applications. Very low odor, dries to the touch in about 60 minutes, and fully cures in ~72 hours. Typical protective life is 5+ years before touch-ups or re-coat.

Where It Works Best

• Ferrous metals (steel, stainless steel, cast/wrought iron) and non-ferrous metals (aluminum, brass, copper, tin).
• Adheres exceptionally well to primers/e-coat and new steel surfaces; ideal on newer vehicles with no surface rust.
• Not intended for surfaces with existing surface rust (use Original Woolwax for rusted frames).
• Excellent for high-wash areas like wheel wells.

Key Benefits & Features

• Water-based, near-zero VOC formula; low odor.
• No solvents; no petroleum content.
• Long-lasting protection against rust, moisture, and road salt.
• Chip guard & sound-deadener in addition to corrosion prevention.
• Can be sprayed or brushed/painted; compatible with most undercoating guns.
• Made in the USA.

Important Application Notes

• Dry/cure: ~60 minutes to the touch at 75°F; ~72 hours to fully cure.
• Finish: Applies dark grey/blue; dries to a matte black (this is not a rubber coating).
• Appearance: Expect somewhat uneven appearance on used vehicle surfaces—normal for this formula.
• Temperature to apply: 50–90°F. Store at room temperature.
• Recommended thickness: Apply 12–20 mils wet to achieve 8–10 mils dry after full cure. Coverage ~60± sq ft/gal (varies by surface).
• Permanence: Not intended to be removed. Be certain you want a permanent coating before applying.
• Clean-up: Wipe any excess immediately with a damp cloth before it begins to dry. Keep container tightly closed to keep air out.
• Shelf life: ~6–12 months depending on storage; do not purchase more than you’ll use within a year.

Heat & Performance Notes

• Corrosion resistance: Functions as a corrosion-inhibiting coating on properly prepped surfaces.
• Heat: Will burn off at ~140°F. Do not apply to tailpipes, mufflers, engine blocks, or other high-heat parts. (Typical heat-resistant coatings tolerate ~600–1000°F and are different chemistry.)

Topcoating & Related Products

• Topcoat options: Can be over-coated with most urethane, acrylic, or alkyd resin automotive topcoats for UV resistance or gloss (after full cure).
• Enclosed cavities: For doors, rocker panels, and frames, use a dedicated cavity wax. Recommended: Creep N' Crawl Cavity Wax.

How to Apply

• Use almost any undercoating gun (spray) or brush/roller. This is a relatively low-viscosity water-based coating.
• Apply generously to account for water evaporation; ensure you’re left with a solid dry film (8–10 mils).