Filler is used for correcting natural gaps and splits, and for filling joints that do not fit very well. When filling gaps in wood that will eventually have a clear finish, the filler must be the same colour as the wood.

Proprietary brands of filler paste are available in a wide range of colours to match various woods. Try them on a scrap piece of wood first, as they do not always match too well, many becoming darker as they cure. Some fillers might look the same when first applied, but if stained the areas of filler will show up as a different colour.

I often fill holes using a paste made by mixing PVA glue with fine sawdust from the vacuum bag on my sander. I push this into the holes using a flexible knife (see Fig 5.2), and sand it flat when it has dried. If the final finish is to be an opaque paint, a cellulose filler - the sort used for filling the cracks in walls before they are decorated - is adequate.

FIG 5.1

To prevent you inhaling dust that might be harmful, connect the sander to a dust extractor.


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