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Originally Posted by zombywoof
Obviously the only wood that would be grain filled is that used for the back and rim such as rosewood.
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And the neck, bindings or head veneer, or any other part for which a smooth finish is desired when using an open-pored wood.
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Unless it is an all-mahogany guitar, there is no reason to apply the technique to the finish of the top.
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Koa is sometimes used for tops and usually requires pore-filling, if one wants a smooth surface. For conifers, which are generally close-pored woods, you are right, no filler is required.