Hi Andrew
If there is no bare aluminium, a rub with wet and dry should be okay..... probably 600 ~ 800grit would do. Just remember if there is bare aluminium, it needs etch primer first then the colour/base coat [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]
As for 4ltrs.... I guess you're going to "gun it" so with a bit of thinners the paint should last two or three good coats if you don't paint the roof. Brush or roller would make less coats but would be much more resistant to damage and last much longer.



				
				
				
					
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