Airlane:
The skin needs to be free of surface oils for best adhesion. I think there also some sprays that slow down the rate that moisture and oils that come to the surface. The effect is making the adhesion last longer.
You last 2 questions are a function of the size of the breast form. There is a point at which the size and weight of the form is too much for the sticky material. The vendor or manufacturer of your forms should be able to tell you what the limits are. If they cannot, they may not be the one to do business with…
We don’t have a dedicated fashion and makeup section here, but our sister site, Crossdresser Heaven, does. You might try searching over there or post your question…
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