POLL-Paint or undercoat?

Paint them then go to Lowes for a roll of insulation for $50.00 that will cover the whole car/ It is very lightweight and glues on. I used it on my roof, firewall, floor and doors. Cant beat the price and it is about 1/4" to 3/8" and is easy to work with. Another member here used it and its great, saves a lot of money to. I also know a restoration shop that uses it. Let me know if you need more info.