are they heat insulator??
but the shopkeeper told its thermacol foam.
i did this on my boot now the interiors are little quite. no engine noise. i think this is a must have on nano.
now after completing all the doors and boot there is almost zero noise in the cabin. even the horn sound or the train moving when you wait in the railway crossing is much reduced
I am back after a productive weekend, did some DIY on my Alto like removed sun films and dampen doors with thermo form. Rattling reduced a lot, but still I am hearing some sounds inside!