Baking soda is good, so is micro balloons and I have used balsa dust that I get from around my sander or saw. Ca works OK but the wood glue is much easier to sand. I keep A tub of ultra light wood filler found in any good hardware store on hand and use it the most. The tub weighs more then the filler. Easy to sand and when dry I lay A thin coat of CA over that if it's used in any stress area. There's A ton of different ways to get around the block.