POWDERED MAHOGANY...

Comes in handy when you need to replace missing veneer from the plywood back of a trashed crap guitar.

When (not if) you've got everything well aligned you pour in super-fine super-glue & while that's setting, you pour in powdered mahogany & you swamp it with more super-glue. This will set pretty quickly & you need to level it all & varnish it over, then polish.

Yeah - there's much more to it than that, but you've got the basics!