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It's a very light wood, almost too light. The straight hard part of the grain can cause a wavy,ridgy surface after sanding since the softer parts between the hard grain will sand away first leaving the ridges. So maybe light sanding can reduce that, go slow.
You should definately use an oil exterior primer on redwood.
It is a very soft wood so it will dent very easily.
It may split easily too.
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