May I suggest a two pack soft sand woodfiller,Wurth uk do a good one. If you do decide to laquer it then rustins do a plastic finish which is brush on.(also sold in small amounts). Three or four coats then 1200 grit wet and dry then t cut ( car burnish paste), to get it smooth Use a cork block when sanding so the filler and the finish are flat when sanded. If your filler is too hard then you end up sanding the wood and not the filler, a single pack filler can be used but this will ''sink'' when drying so you will need to fill at least twice. Hope this helps.