When gluing pieces of wood together, don’t sand the two gluing surfaces too smooth. If the wood has come off of a jointer or planer or has been sanded finer than 180-grit, scuff-up the gluing surface with 80 or 120-grit sandpaper. This will improve adhesion and actually make the glue joint less visible. This is also useful when joining the two (or more) parts of a neck, an acoustic or solidbody’s book-matched top or back, and any other glue joint.The glue in the joint will virtually disappear, since the “fuzz” raised by sanding on each piece will intertwine and the glue will penetrate deeper into the open fibers. The hard, crisp surface left by a jointer or planer is too smooth and also has the fibers of the wood pressed down. This will leave a distinct hard line on each side of the glue in the joint.
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