Q: I would like to make some cheap instruments and use higher grade plywood. What type of filler do you think I should use to fill the plywood edges? Should I use something like Bondo?
A: Bondo, which is a brand of polyester filler with added fiber, would be an excellent choice. By the way, the highest grades of plywood, such as Baltic birch and dieboard, will not have voids, but will show layered but solid edges when routed. In that case, where you are dealing with subtle texture rather than voids, I would go with any of the many putties on the market. My favorite for a job like this would be Timbermate. http://www.timbermate.com/
Michael Dresdner
straight talk about wood finishing
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