I have just had a new front door fitted leaving two gapping holes in the fram where the old locks were. What would be the best wood fillers to use the door fiter said to use builders bog, the door frame ihas been stained in oil rich would stain which I would like to keep. In the past if it was to be painted I would use Plasti- bond but staining this does'nt work out all that well, any ides thanks