It's my understanding that the barrier coat keeps the boat from absorbing water. Bottom paint only keeps the growth\crud off.  If your boat has a good full barrier coat, then you would only get a weeks worth of growth\crud on your bottom. This may not be that bad, esp if you use it a lot. If it starts to build up, put in on the trailer for a cleaning, or brush it off in the water at the dock when needed. 
 
Remember, the reference of "a weeks worth of crud\growth on your bottom" only applies to your boat. 
 
rkc
		 
		
		
		
		
		
		
			
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				Sorry to say that I no longer have a 1984 V20 :(
			 
		
		
		
		
		
	
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