RTV as muffler patch?

I've used hi-temp RTV to fix muffler and exhaust pipe holes as well. But I've only done it as a temporary fix. Needless to say, if it rusted through, the rest of it isn't too far behind.

I've used aluminum sheetmetal in conjunction with the RTV. Where possible, I pop riveted the metal over the hole & RTV. I've also used the threaded hose clamps to hold it in place, where applicable, as well.