Turntable

It's another lubricant, no more, no less.  Maybe it is superior to other common choices for turntable bearings.  Maybe not.  I think Miguel raised an interesting question, but none of us is qualified to say yea or nay, since none of us has used it for this application.  But it's not "magic".  The first thing that I would verify before using it on a turntable is whether it is corrosive for either the bearing (which is typically a ball made of an exotic metal) or the thrust plate.  If not, have fun.

ebm,

Why would it be a bad idea?

Mr. M, I will answer the question you posed to EBM by referring you to my post just above which mentions that an unknown complex lubricant might contain additives that could be corrosive for the ball bearing or the thrust pad. To know whether that could be a problem you would need to know the composition of the ball bearing and of the thrust pad and of the new lubricant that you want to try. In this case, we know none of these things. After that, you would need to consider the actual new lubricant and whether it is indeed superior to known good lubricants for the turntable bearing.

Hello,
I think you have not understood the question.
To begin with, Metal Lube is not a lubricant. It acts on the metals, sealing the pores and does not replace any lubricant. It is necessary to add a lubricant type with metal lube agun.
I can recommend tribology books.

@raymonda ,

I guess I thought that "Metal Lube" was an unknown to most here (me included), which is why I thought the OP should have described it in his initial post, thus decreasing confusion going forward and increasing the probability of positive/useful responses.