Stinger RKX4 Roadkill Expert Universal Kit 2 Sheets 4 Square Feet Ultra-Dense Butyl and Aluminium Sound Deadener The RKX4 from Stinger is a Roadkill Expert universal kit containing two sheets with a total coverage of 4 square feet. Built from a proprietary ultra-dense butyl blend with an aluminium top layer, it mass-loads vehicle panels to reduce vibration, improve speaker bass response, lower road noise, and provide thermal insulation. The material is odourless, non-toxic, and self-adhesive. Product overview Roadkill Expert is Stinger's core vibration damping material, designed for application directly to metal panels throughout the vehicle. The proprietary ultra-dense butyl blend absorbs acoustic energy at the panel surface, while the aluminium top layer assists with heat dissipation and provides a finished surface compatible with further acoustic treatment if required. The RKX4 two-sheet entry kit is suited to targeted single-panel treatments such as a single door, a speaker cavity, or a section of floor area. Applied to door panels, the material mass-loads the thin metal to reduce the vibration that degrades speaker performance at higher volumes. Applied to floors and transmission humps, it reduces the low-frequency road noise that contributes to driver fatigue. Applied to firewalls, it reduces heat transfer from engine bay and exhaust temperatures into the cabin. For larger coverage areas, the RKX36B nine-sheet bulk kit provides 36 square feet from a single purchase. Installation requires no specialist tools. Clean the surface with wax and grease remover or methylated spirits, cut each sheet to the required shape, peel the self-adhesive backing, press into place, and roll flat with a Roadkill roller. The RKINSTALL roller and knife kit is recommended for best results. Features and benefits Ultra-dense butyl blend with aluminium top layer: The proprietary butyl blend absorbs acoustic energy at the panel surface to reduce vibration and road noise, while the 6 mil aluminium top layer assists with heat dissipation and provides a finished damped surface suited for further acoustic treatment. Improved speaker bass response and output: Mass-loading door and speaker cavity panels reduces thin metal vibration that degrades speaker performance at higher volumes, resulting in a more solid mounting surface for better bass response and improved overall speaker output across both factory and aftermarket speakers. Road noise reduction: Applied to vehicle floor areas and transmission humps, the RKX4 reduces the low-frequency road noise that enters the cabin and contributes to driver fatigue and elevated cabin noise levels. Thermal insulation: Rated from -62°C to 149°C, the material reduces heat and cold transfer through vehicle panels, keeping the cabin cooler in summer and warmer in winter. Particularly effective on firewalls where engine bay and exhaust heat enters the cabin. Odourless and non-toxic: Contains no harmful or odorous compounds, making it safe for use in enclosed vehicle cabins without the unpleasant smell found in cheaper sound damping products. Self-adhesive installation: The self-adhesive backing allows the material to be pressed directly onto the cleaned panel surface without requiring separate adhesive. Each sheet can be cut to shape with a knife before application. What's in the box 2x Roadkill Expert sheets (12" x 24" each, 4 sq ft total) Technical specs Specification Detail SKU RKX4 Brand Stinger Coverage 4 sq ft total (2x sheets, 12" x 24" each) Minimum Thickness 0.080 in (approximately 2mm) Aluminium Layer Thickness 6 mil Damping Weight 0.65 lbs/ft² Peel Adhesion Strength 40.89 lb/in after 24 hours Application Temperature -62°C to 149°C (-80°F to 300°F) Weight 1.5 kg Dimensions 9.9 x 40.1 x 9.7 cm Adhesive Self-adhesive backing Odour Odourless Toxicity Non-toxic Frequently asked questions What is the difference between the RKX4 and the RKX36B?Both are Roadkill Expert kits with identical material specifications. The RKX4 contains two sheets for 4 square feet of coverage, suited to targeted single-panel treatments or trial applications. The RKX36B contains nine sheets for 36 square feet, suited to full vehicle treatments or installer use. For larger jobs, the RKX36B offers better value per square foot. What surfaces can the RKX4 be applied to?The RKX4 is designed for cold rolled steel, galvanized steel, e-coated, and clear coated metal panels. It is suited for door panels, floor areas, firewalls, roofs, boot floors, and any other vehicle metal panel where vibration, road noise, or thermal transfer is a concern. How much area do the two sheets in the RKX4 cover?Each sheet measures 12 inches by 24 inches, providing a combined total of 4 square feet. This is suited to targeted applications such as a single door panel, a speaker cavity treatment, or a small floor area. For larger coverage areas, the RKX36B bulk kit is the more practical choice. Do I need any special tools to install the RKX4?No specialist tools are required. A wax and grease remover or methylated spirits for surface preparation, a knife for cutting to shape, and a roller for pressing the material flat are all that is needed. The Stinger RKINSTALL roller and knife kit is recommended for best installation results. Is the RKX4 safe to use inside a vehicle cabin?Yes. The RKX4 is odourless and non-toxic, making it safe for use in enclosed vehicle cabins. Unlike some cheaper sound damping materials, it does not emit unpleasant or harmful odours after installation.
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