No need for anything wider than 18", and you only need one sheet. Check out Vencil and his crew at the 3:23 mark to see how to wrap perfectly: https://vimeo.com/42787761
"I'm new school, I use a thermometer" then pulls out some old analog thermometer. LOL.
There was some very important details in that segment.
Like what? I did not agree with any of it.