Can the shim be colored to match the old soundboard?
Yes, you can tint the shim slightly using a dye stain sprayed with an air brush. However, you must be very careful not to overdo it. Spray freehand, do not mask the edges of the shim, and apply much less color than you think you need. A shim that looks properly tinted initially will appear as an obvious paint stripe after the final clear coats are on the board. Realize that the new white shim wood will acquire an amber color with time and look much less obvious. See our publication, Router Repair of Soundboard Cracks for full details.
