What deg of high heat paint should be used to paitn a downpipe.   only asking because i painted my dump pipe with hight hwat paint about 3 months ago(i think it was 500 deg) and now its rusted color again.  will any type of paint not wear off of the downpipe????
	
		
			
		
		
	
				
			 
 
		 
 
		 
 
		