Two of the greatest car sounds are the sound of a well-tuned engine and the distinctive singing gear sound of a transmission. And two of the worst sounds are road noises and car squeaks.
Recently while putting new interior in my ‘48 Packard Custom 8,, we sound-proofed the car, making for an unbelievable whisper-quiet, noise-free ride. I was so pleased with the quietness that I decided to put sound-proofing in my ‘49 Buick Sedanet. We are restoring this car back to its original condition, and had all the interior out, so it was easy to sound-proof the car.
The problem with insulating can be gluing the fibrous insulation to metal. When water comes in contact with the insulation, it rusts the metal it is next to. To prevent this, we took the following steps: 1-Put rust preventative on the metal to seal it, 2-Glue rubber sound deadener to the metal (floor boards, etc.), 3-Glue the fibrous insulation (juting) to the sound deadening material, 4-Carpet or install door panels over the insulation.
The rust preventative is very important. We have used “Zero Rust”, available from Buick Specialists (253-852-0584) and POR-15 (800-777-6715). This runs around $30 a quart, but it is the best money we’ve spent. In the doors, we used an undercoating gun to spray the product, and on the floorboards and trunk, we brushed it on. After about three hours with the material still tacky, we primed (this will give the insulation something to stick to). After the primer was god and dry, the sound deadening material was glued to the metal. We used liquid nails in a caulk gun and left the adhesive side of the sound deadener up to adhere to the foil side of the insulation. We cut around the transmission cover, foot pedal, inspection plate, etc., and covered them separately, but used a waterproof, non-drying adhesive, so they could be removed easily. Now, with the foil stuck to the sound deadening material, it’s time to install the interior. These materials go on easily and conform to drive shaft tunnels, etc. These steps take a little time and money, but the results are well worth it. Keep your batteries up and your cars on the road.