Linseed oil...

[Brian Dick]

I've never cut RLO with turps or done any of that. I use a nice sunny day out back to warm up the cleaned woodwork and apply it straight up with a sponge paint brush. Let it soak in a bit and rub it out gently in light circular motions with 0000 steel wool while wet. Wipe off the excess with a blue paper shop towel and take a toothbrush to make sure there is no excessive buildup in the insetting and bearings. Let sit overnight and continue the process as many times as you want until the wood stops taking it in. It's really simple, non toxic and they turn out perfect every time.