Most of my soaps are glycerin based. Glycerin dew is what is happening when your soap “sweats”. This is more common in humid environments (I am in Utah and this does not occur here).
Glycerin is a humectant, this means is draws moisture (water) to it. This is why my soap is very moisturizing, it literally draws moisture to your skin. It is also why, in humid climates it “sweats” ( becomes moist, gooey, etc, especially during shipping or storage)
This does not effect the soaps efficacy, it will work as well as ever, and once it is being used, will not be noticeable (since you will be using it and getting it wet frequently).
My soap is best if used within about a year. As they age they shrink (due to water loss). They do get harder and last longer as they age, however they start to lose their beauty and may start to crack or dry after that time. They are still useable, but will lot be as pretty.
Enjoy your soap!!
Shandie