Thanks NeverBX and aeromang.
It turns out that the heat shield I am talking about is the one that is on top of one of the long exhaust pipes near the front. There is another one with the manifold.
I'll take your advice aeromang and try it.
I talked to a Honda Service guy and he tells me that due to liability reasons he has to inform me to replace it but on a personal level, he sees no reason to repair it. He said I could chuck it out if I want to.
But I'll try the metal clamp approach. Seems cheap and useful.
mundy5