I use a spray bottle and re-fill from a gallon container. It takes about a quart (32oz) for the outside (maybe a little less). I have not done the roof yet but will upon our return so don't know how much that will take. I would think that the older, more deteriorated it was the more it would soak up. I buy mine on Amazon.
I have not used the 303 on the awning....yet. I think it would be OK. Someone has probably used it and can respond to your question.
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