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We stopped doing much finishing due to cost and keeping a spray booth within the shop. AQMD and everyone is on my ass about paying up. I don't just build cabinets for people anymore but my own clients when we rebuild the whole house.
I spray and fussed with building guitars in my late 20s. I discovered the tone or sound changes with different type of finish, or top coat. I found Automotive finish and poly is a bit heavy making the sound a bit muted. Typical modern nitrocellulose lacquer is the closest to what a guitar should sound like and there are many kinds out there. The lacquer is getting harder and harder to find here in CA. Two or three thin coat of pre-cat lacaquer maybe the best if you ask me. As far as going over oil based satin, I have done that with great success. The real trick is to allow enough time for the oil to complete dry. Depending on the brand or formula, it may take some time.
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