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Al’s HNR, Heat and Noise Reducer, is a proprietary blend of latex synthetic polymers. It contains acrylic, PVA, and Vinyl Styrene and is reinforced with ceramic micro spheres that provide incredible insulation, heat reflection, and sound deadening properties. HNR can withstand up to 500Â°F and reflects exterior temperatures y 45Â°F or more. HNR can be applied to virtually any substrate with minimal prep. It works just like latex paint. it is excellent for interior automotive applications of all types. Al’s HNR keeps your vehicle or boat cool in the summer and warm in the winter.