I wouldn't spray any foam in the boat.  My fuel tank had holes the size of your fist when I pulled it out due to the foam absorbing salt water and rotting it out.
		 
		
		
		
		
		
		
			
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				1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 
1979 Marine Trader 44, twin Ford Lehman 120s 
2006 Panga 14, Tohatsu 20
			 
		
		
		
		
		
	
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