I was wondering what a good product is to use to fill the voids or cracks in the knots of knotty alder. Some of the cracks are as much as ¼ inch wide. Also, I was wondering what a good product is to use for a multi-step finish on alder. I have not used a multi-step finish yet, so I was hoping to find one that is relatively easy to learn to use and apply.
From contributor J:
We do Rustic finish on knotty alder, knotty cherry, pine and etc. which is very popular in the states. We don't usually fill the cracks in the knots because it adds to the rustic look of the wood. We use ML Campbell stain and glaze it with water base wet glaze from Pratt and Lambert. If you really want to fill those cracks you could use tinted wood fillers after sealer, or colored wax crayon sticks from Mohawk.
If the knots aren't actually holes through the boards and just small pin knots, then I use the Elmer’s stainable putty that you can find rather inexpensively at any local Home Depot. It comes in a variety of colors - natural, walnut, white, golden oak, red oak, and mahogany. Knotty substrates are pretty. They have character and a nice woody look.