Meg I do this for my piecing thread and it does make a difference in my humble opinion! My stitches look nicer and I have NEVER had any issues with oil spots. Mineral Oil is not an oil like say baby oil. It is the same thing thread lube is made of and it is much cheaper than buying that little bottle at Joanns. You don't have to soak the thread either you can just put some beads down the spool or cone and add as you use it. Remember anytime you have a problem with stitches on the longarm you can use the mineral oil too. I don't usually need to but sometimes with things like metallics it can make all the difference. I use this on my Viking and I have to say it has never sounded so good or stitched so nicely! You don't have to soak it so that the thread is saturating the machine either. Funny that I've heard even Bernina is recommending this on one of their newer models, can't remember which one but it solved the complaints about broken thread.
Oops, actually baby oil is mineral oil which is simply a petroleum oil product.
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Oops, actually baby oil is mineral oil which is simply a petroleum oil product.