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I would spray near double the amount you want for your final thickness because to sand out the orangle peel you will need to take out quite a bit of thickness. Measure for yourself the area you need to cover and don't trust other people's numbers. You really need to calculate the amount you need to spray to get the thickness you need, otherwise you are spraying blind. I perfered to spray about half of the bottom at a time because that allowed to cover the area more evenly. I think I need to repeat that you need to calculate how much you need to spray to get the thickness you need. I think you will find it will be much more than you think you need. Also, Duretec did not reduce orange peel for me.