[quote=Dogboy]Typical imperfections in the bottom - imperceptible. If the indentations are rougly aligned with the fore/aft axis of the hull, you will not even notice them. The only real reasons to do anything about them would be 1) the hull is structurally compromised or 2) they cosmetically bother you.
Defects on dagger boards or rudders are a little different. Since the rudders and boards need to provide lift, surface imperfections can disrupt the flow to the point that the rudders or boards stall prematurely or simply don't point as well upwind. Again, there's not likely to be an perceptible reduction in max speed, but you may notice handling issues at higher speeds or when you're pushing the boat hard. I would use a sanding sponge to knock of any brush marks and then wet sand to 600 grit or higher for best performance.
You are correct that proper tuning and boat handling will have MUCH more effect on performance than minor imperfections in the hulls and boards.
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