This is a wax made to prevent humidity and cracks on the guitar.It is excellent.
No chemicals at all.It is insecticide and additive-free.”this is no food.”You can use this wax for new to vintage ukulele. It is safe.
If you use Silicon wax,it damages paint very much when putting for a long time.(It happened to me.It melted the enamel on an old Gibson guitar. )

< How to use >
Spread the wax as thin as possible with a sponge and then,let your instrument dry between 18~24 hours.Then,wipe with a cloth,not using chemicals.However,there is a special oil for the fret.I use this wax only.
The touch is very natural, so I play comfortably.It costs about $22.
It is a reasonable price.Enough for more than 60 guitars.