Antigravel - Toyota Corolla, 1.6 L, 2002

I treated the bottom with an anti-gravel coating Dinitrol 479. For this, the car was first disassembled a little from below (the fenders were removed), thoroughly washed, dried and applied in 5 layers.
This synthetic composition, accordingly, does not burst in frost and does not flow in summer. At the same time it has an anti-corrosion effect.
I thought it would be an order of magnitude quieter, but I didn't notice the difference right away. I noticed her when I drove along the familiar gravel road. The noise inside the car was the same when driving at 15 km / h before treatment, or after treatment at 40 km / h.