OK. Everyone has their opinion, trouble is some opinions are wrong. Here's what to put on focussing helicoids - http://www.nyelubricants.com/products/damping.shtml - nothing else.
Other products may work, in varying degrees, but most have disadvantages ranging from creep to outgassing to excessive wear and all carry the disadvantage of having to do the job over again, usually involving extra work due to the aformentioned creep and so on.