Restaining veneer
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Veneer is just a very thin layer of wood and can be treated as such. Yes, it can be stained and sanded. Caution should be the word in sanding, however. Most veneers are quite thin, and they can be sanded through.
Even though I own some great shop sanders, I usually sand veneers by hand. This lets me keep a closer eye on what I'm working on and get the smoothness I desire without the danger of sanding through the veneer into the backing. Believe me, you just don't want to go there.
Veneer (like any other wood) has to be free of finish before it can be stained. If it's too dark now, you'll need to use a two part bleach (look for that description) to lighten it before re-staining.
Even though I own some great shop sanders, I usually sand veneers by hand. This lets me keep a closer eye on what I'm working on and get the smoothness I desire without the danger of sanding through the veneer into the backing. Believe me, you just don't want to go there.
Veneer (like any other wood) has to be free of finish before it can be stained. If it's too dark now, you'll need to use a two part bleach (look for that description) to lighten it before re-staining.