Tried RO-59. Here are my results after 3 coats.
TL;DR - It does make noticeable difference in smoothness (smoother) and sound (lower pitch). Adds an attractive mesmerizing sheen to surface. No issue when a layer of 205g0 is added on top.
New Nixies
Housing and stem coated with RO-59 then lubed w/205g0 is smoother in feel, cleaner and lower-pitched in sound than my other set just lubed with 205g0.
Kailh Black v2 long-pole stems
In New Nixies from above - I wanted to improve on New Nixies sound so I’m in midst of coating the stems. Tried a set of 10 New Nixies from above with these stems. Minor ignorable loss in travel distance. It did do what I wanted sound wise but there is a bit of squeeze at the bottom that doesn’t feel satisfying. Going to need a pencil sharpener like jig to fix this.
OG NK Cream - No loss in travel distance. More solid lower-pitched sound. Noticeably smoother. Promising enough to try a full set in-use. Can’t argue with smoother Cream.
Black Lotus - No loss in travel distance. Solid lower-pitched sound. Oddly less poppy but still good. No change in smoothness so I think RO-59 can improve less smooth switches as smooth as JWK boutique switches. Good enough to try a full set in-use but I like Black Lotus as-is too much to do that.
I have a few more long-pole switches switches without loss in travel distance to try with later. Only real blocker is whether inside bottom of the stem hole is tapered or not which leads to that unpleasant squeezing feel.