Some woods do not respond well to the various oil finishes. These are the high oil woods like cocobola, rosewood, etc. These are often used as gunstock grip caps and forearm caps (My main experience was in gunstock making). These oil will come out and often make bubbles under the finish. On gunstocks, the better finishes for these woods were lacquer and epoxy. Some would use acetone to get rid of the surface oil, but it usually comes out eventually, anyways. Some oil finishes like tung oil are best applied a drop at a time then rubbed in vigorously. If applied in large amounts, it will appear (and FEEL to dry) but will turn sticky again in hot weather. No fun to put a bearded face up to the cheekpiece on one of these. Linseed oil is an old gun favorite, but unless dryers are added, never really hardens. It is also rather ineffective against moisture intrusion, rated at 15% in government tests against 75% for Tru-Oil which still contains some linseed oil. Linseed oil is photosensitive which will darken with age...but it takes many years. Pro-Custom Oil is another good product and does not darken the wood when applied...available from Brownells and can be applied thickly. Finishes can be "in" in the wood or gradually built up to be "on" the wood, but I personally prefer no finish on a working knife. Good buffing (use quality buffing compound and a very soft buffing wheel) is my preferred look. Remember, too, that not all sandpaper is created equal. Very fine sandpaper is found at car product stores for fine finishing of auto paint. Good luck.