The liberon shellac filler sticks are the traditional repair sticks for filling holes and cracks prior to french polishing lacquering and varnishing performance for filling holes and cracks in finished and unfinished wood prior to french polishing sets very hard colours are intermixable 3 colour tones per pack application melt stick with a hot iron or soldering iron and run into the damaged area allow to harden and remove any excess with a scraper or sharp knife lightly sand to a smooth f