I feel it will no longer be healthy because the jelly applied to the leaves blocked the stomata. As a result, the plant would be deprived of oxygen needed for respiration. It wouldn't be able to carry out photosynthesis since it wouldn't have access to carbon dioxide.
Another Answer could be:
When you apply the jelly to the stomata of the leaves, they become covered, and transpiration ceases. This reduces the escape of water vapour and allows the leaf's moisture to be retained for a longer period of time. However, because the jelly layer prevents all sorts of gaseous exchange, photosynthesis and respiration are also impossible.
