Using adhesive seals while wearing laboratory gloves is often difficult. The glued surface of the seal can easily stick to the glove rather than the microplate. With its adhesive encapsulated in millions of tiny spheroids, this new sealing film, when first handled, is not sticky and can be quickly and easily moved into position. When the user is satisfied that the film is correctly placed, they press down hard to burst and activate the adhesive microcapsules. The clear film has good optical properties and produces a very firm seal which quickly forms a near-permanent seal on the plates.