--- Sure they would [be thick enough]. The only thing which would make the traces fail is if they melted or vaporized with 12 amps going through them, and even if they were only 1/2 oz. copper, with a nice coating of solder they should be fine. Remember too, there's only going to current flowing for about a second.
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--- It _might_ not, but it's better to eliminate the source of a possible problem than to have to deal with it later. An ounce of prevention...
-- John Fields