Chad --
I've been using some silicone bronze rod for TIG on the firewall and inner fenders on my BIL's '69 Camaro... this is non structural "flattening" panel from DSE.... and I've been filling some small holes this way as well. Takes very little heat but frankly - I really prefer welding this stuff - even if it takes a bit o'bondo to flatten. I'm afraid of it cracking... even though it's welding - not brazing - it still doesn't seem like it's very strong. We'll see. The good news is he can't demand a refund (what do you want for free? Your money back?) and he can't fire me. It does grind off super easy!
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