Custom Shop Barrier Bond Rubberized Undercoating Kit — 28 oz. 4-Pack, Spray-On Sound Deadener & Rust Protection

This four-can kit from Custom Shop delivers a durable, rubberized undercoat formulated for wheel wells, trunk floors, lower body panels and frames. The spray-on coating creates a protective barrier against moisture, road debris and surface wear while adding a layer of sound dampening for a quieter ride. Each can contains 28 ounces of fast-drying formula supplied with a spray applicator gun so you can cover large areas with uniform results.

How does this undercoating protect my vehicle from rust and damage?

The rubberized formula bonds to metal and painted surfaces to form a flexible, impact-resistant layer that shields against chips, abrasions and moisture intrusion. It does not rely on thick buildup; instead, it adheres evenly to create long-lasting coverage that helps slow corrosion where road salt and grime collect.

• Creates a waterproof seal over seams and exposed metal
• Flexible finish resists cracking under vibration and movement
• Protects against stone chips and road debris impact
• Compatible with most top coats for repair or cosmetic finishing

Will this really reduce road noise and vibration?

Yes—the rubberized texture absorbs and dissipates vibration energy better than untreated metal surfaces, helping lower common sources of road and tire noise. While results vary by vehicle and application thickness, many users notice a measurable drop in airborne and structure-borne sound after coating wheel wells and underbody panels.

• Sound-dampening rubber layer reduces resonance in cavities
• Works well in wheel wells, trunk areas and floor pans
• Even spray coverage improves performance over patchy applications

How easy is it to apply and finish?

The kit arrives ready-to-spray with an applicator gun that gives better control than aerosol cans, speeding up coverage while producing a more consistent texture. The formula dries quickly so you can inspect and recoat in the same day, and it accepts most top coats when you want a painted finish.

• Included spray applicator for smoother, faster application
• Fast-drying formula reduces downtime between coats
• Paintable surface allows color-matching and finishing touches
• Compliant with 50-state VOC rules for legal use nationwide

What surfaces and repairs is this kit best suited for?

Barrier Bond is formulated for automotive undercarriage use but also performs well on truck frames, trailer undersides, inner fenders and other metal panels prone to wear. It’s ideal for seasonal protection, preventive maintenance, or restoring neglected underbodies after cleaning and light rust treatment.

• Wheel wells and inner fenders to cut road noise and debris damage
• Lower body panels and rocker areas for chip and corrosion resistance
• Trunks and floor pans to seal seams and dampen sound
• Frames and crossmembers where flexible protection is needed

Who is this for: Car owners, DIY mechanics and professional installers who need a practical, paintable undercoating with sound-deadening properties. If you want an easy-to-apply, VOC-compliant solution for protecting exposed metal and reducing road noise—whether for daily drivers, work trucks or restoration projects—this 4-pack offers enough product and an applicator tool to cover multiple areas or vehicles.