Was wondering if someone can tell me. I have found a hole on my Exhaust on the Flexi pipe, pre-cat and I wanted to repair it with a Flexi Wrap and some Gun Gum Paste. Can this be used on the Flaxi Section of the exhaust? I was told it can't because the Paste isn't flexible and once hardened will crack thus opening the hole once more, are they correct in telling me this? Thanks in Advance Gwyri