There are many ways to create a smooth finish on wood, but one of the easiest is to use grain filler. In this video, Rob demonstrates how to apply grain filler to create a smoother board surface.
Grain filler is a paste that fills the open pores and grain in a piece of wood. The grain filler is applied across the wood surface with a card or scraper. The excess on the surface is scraped off, leaving the filler down in the open grain and pores. It typically takes several coats of grain filler to completely fill the pores, leaving them flush with the top surface of the board. If you want to create a glassy smooth surface, the kind you see on many guitars or pianos, then you'll need to also do several additional steps of applying finish coats, wet sanding and buffing.

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