Applied boiled linseed oil to a door that I stripped and sanded. After about 6 coats (the first 2 were thinned with white spirit), the finish has begun to go glossy but is also quite sticky and doesn't show any sign of drying completely. Also, the finish is still quite uneven with the knots seeming to absorb a greater amount of oil than the rest of the wood. I'm reluctant to add more coats if all this does is make the surface even 'stickier'. Any advice on what I should do next ? Is it possible to remove the oil and, if so, how ?