I need to fill in some cracks on the ends of an Alder board, that is end grain. One crack is 1/16 wide. I will put a natural finish on the board, so what I use to fill, it will be varnished. Do I use a glue of sorts, and what would you consider. I know this seems like a basic question, but I too know that the filler will be exposed. Thank you.
-- Donald Baty