If you are doing exhaust wrap you really need to get the good stuff. I forget what it's called but you can get it from Pioneer auto parts here, not sure who would stock it around the country. An easy way to tell which stuff is best is that the wrap will be a brown / tan colour as opposed to white and it has a line stitched down either side about 15mm from the edge - to help you line up the layers evenly.
Also if you want to to wrap up nice and tight then put the lot in a bucket of water before starting. When it's wet it expands, so when you apply the wrap it will dry off and tighten up heaps. Like that Jacky Chan trick. Then secure it at the ends with either wire, stainless clips or glue. Works sweet.
Edit: and it does the job of keeping the heat in the pipes better then HPC .