Ditto what Richard said. I found this on ebay for about $7. It says cloth but it's more like vinyl with a nice scale texture. I haven't used it yet but it will be going on my '67 Galaxie to LTD conversion.
The hot water worked. I put a bowl of water in the microwave for 2 minutes then dabbed a rag into and rubbed the bottom of the cowl with slight pressure. Did this 3 times then put the firewall in place. I think I'll give it one more pass to get it just right. Thanks for the tip!
This is why I have a hard time understanding those who say they don't want to retire because they wouldn't have anything to do. Spending time on your passion is what retirement should be about. Maybe one day I'll know what it's like. Great work & keep it up.