1. Underbody Antirust coating - A Definite Yes
2. Overall Body Teflon - Well, Only if you have 5K to spend AND your car will be parked outside, not in a shaded area, without any car cover - Only then go with it
3. Alloy Wheels - There are no scientific studies to back any advantages in favour of Alloy wheels. If your car has 15inch and above size rims, You may consider alloys but 15inch and less, they are good only as a cosmetic change. Remember, Typres have more impact on the overall ride quality than metal(steel or alloy) wheels.
And since i10 has tubeless tyres so be ready for a harsher ride specially if you are coming from a maruti background Alloys wont come handy in this case. But again, Tubeless tyres have their own advantages over tube+tyres.
Suraj
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