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The pore filler is a primer, generally colorless, used on porous materials in order to seal the roughnesses.
Its use makes it possible to reduce the quantity of final primer to be used and to have a better quality of finishing. It also gives a brighter appearance to the support.
One or more layers fills the surface porosity and prepares the wood for the application of a primer. The wood will be sanded or rubbed after a first application of pore filler using a brush or an abrasive pad such as sandpaper.