Single sheet, just have an extra hand or two handy as it is do-able, that way you don't have to match the pattern up then. Try it out on something small too, as using the heatgun to much will burn the carbon, over stretch it whilst its hot and on cooling it can split a little. Brilliant stuff though, pm me and I'll link you what I was recommended. I will also send you a list of whats needed and stainsey's guide he sent me.