LEAVES OF HEALTHY POTTED PLANT WERE COATED WITH VASLINE . WILL THIS PLANT REMAIN HEALTHY FOR LONG .GIVE REASON

The plant could not remain healthy because it cause blockage of stomata, as petroleum jelly will not let the air to pass through and will make the stomata unable to respire and the petroleum jelly absorbs heat  this will adversely affect the plant and will harm its leaves and stomata's. 
The chemical composition of Vaseline contains the residue and compounds of petrol and its product which is very harmful for the plants and these composition can dry up a potted plant if applied on their leaves.