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Recently, I had an exchange with a friend who does woodworking as a hobby, and the exchange made me realize that the need to thin oil and varnish, especially varnish, and including polyurethane [...]

The solution is to tint the new finish with dye. Varnish yellows with age and that’s the reason your newly finished drawer doesn’t match the old.

Q: Does varnish go bad sitting on the shelf? A: Unopened varnish should last for years on the shelf when kept away from excessive heat. When a can is opened and the finish exposed to oxygen, [...]