Silicones come in two classes. The stuff in tubes which cures on its own
with an ammonia smell sticks to almost everything. The two-pack silicones
(Google for Silastic) will peel off anything, although they can hold pretty
well until they are peeled. They are excellent for replicating very fine
surface features, or for making moulds for casting. They might work for your
application, but not in a blu-tack way of permitting relocation, you would
need to apply fresh material.