Working with African Mahogany. I've got maybe a 1/16" gap on 2 mitered corners. Started using one of those colored wax pencils, but not sure this is going to fill it. Also, I mis-drilled a screw hole and need to fill it as well. I'm only using a thin resin-based lacquer (dammar crystals dissolved in turpentine). Any advise on what to use to fill?