Jonathan , what I do for my fret work is to dip it. I have a large aluminum roasting pan that I put a layer of BLO in, then lay the piece in and swish it around ( gently ) to cover it completely. Then I allow it to drip for several minutes on a rack I made to fit above the pan . After that, take several thicknesses of paper towel, place the piece on it and use several more to " blot " it . The paper towels will wick all of the oil from the frets. Change the towels as needed to remove the excess oil and then hang it to dry . Use a piece of wax paper underneath to protect your workbench . Do not ball up the paper towels and throw them away!! BLO heats up as it dries and can spontaneously combust if balled up ( trust me on this :BangHead: ) the paper towels should be spread out flat outside until dry or use other appropriate disposal methods . If the panel is allowed to dry indoors it can be ready within 24 hrs with a 1/8" or 1/4" panel . Good ol' sunshine does a good job too :icon_thum
Rub a piece of brown paper bag on a large area and see if any oil comes off on the bag. No oil , piece is dry. I then use a couple of light coats of DEFT spray ...whatever finish you desire. After a couple of hours, burnish the piece with a piece of brown paper bag (careful of that delicate fretwork) and you're all set. If the piece will be framed with glass, the DEFT is not really necessary. As DaveO said, the piece is protected by the oil
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hope this helps