I used to work in the lead industry. Mining, processing smelting, refining and sales. Lead metal has virtually nil toxicity. Lead oxide is a different story and is very closely monitored and controlled in operations producing oxides.
Lead sound absorbing products are very effective but expensive. I've first hand experience with a high end yacht that used lead sound proofing materials placed upon Aluminum integral fuel tanks. The tank tops rotted out. The fix was not cheap.
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