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I want to make a small mold I would later use to create a fiberglass 
		
	
		
		
		
		
		
	
		 
		
	
	
	container to hold lead weight. It would be nice if mold material can withstand 500 degrees Fahrenheit so I can pour lead into it and then cover it by fiberglass. Alternatively I would use the mold to create a fiberglass container first and fill it up with lead pellets. So my question is what do I use to make a mold, gypsum if so what kind, anything else? Andrzej  | 
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