I use an artists drying linseed oil I got in a crafts shop. Small 2.5fl. oz. bottle last me forever as I just use it for a couple of very thin top coats over the finish. It does dry in about a day,,day and a half. I just put my thumb over the mouth of the bottle, tip it up and that amount that stays on my thumb is enough to be dotted around one side of the stock and rubbed out as thin as possible. I also use it for brushing into new or recut checkering. Sometimes I'll go back after 6 hours or so of the application and re-rub out the oil on the stock as it's not dry yet at that point. I've just always done it that way and it seems to smooth it out again if I missed any spots and takes away any excess onto my hand. The brand is 'Winsor & Newton'. Labled as 'Drying Linseed Oil for Oil Colour' on the front. Says it's made in England/Winsor & Newton/London (gotta be good,,right??!!). Ingredient lable says linseed oil/manganese dryers (Certified non-toxic). Hope this helps..