polyester

Just got my first car, and i've been told repeatedly that towels with polyester will scratch my car.... to use only 100% cotton or microfiber towels to dry it. i picked up a pack of Eurow MF towels from costco, dried my car, then realized they were 80% polyester. did i just mess up big time?

I got into an accident while going to work. I women side swiped me. I talk to the shop teacher at the vo-tech school I used to go to. He told me he would use polyesther paint cause it's more durable than Dupont paint although it's more expensive. Can someone tell me more about paint, and is...