According to an analysis of the German Federal Institute for Risk Assessment (BfR), sealing sprays for glass and ceramics containing moisture-repellant nano particles and a propellant should not be used in confined spaces.

At the beginning of spring 2006, the poison centers of the federal states have reported 39 cases involving serious health disorders following the use of household products of this kind. All the people involved complained of respiratory distress. In six cases pulmonary oedemas were diagnosed which had to be treated in hospital.

Some users suffered severe health disorders after using aerosol cans. It seems they had inhaled components of the spray which had remained in the ambient air as fine particles of the aerosol. The particles from the spray may have disrupted the function of the alveolar and bronchial tissue in the lungs and, by extension, oxygen and moisture exchange. This led to respiratory distress and, in severe cases, to accumulation of water in the lungs (pulmonary oedemas).

No such incidents have been reported in conjunction with products applied to surfaces using pump bottles.

Because of these recent incidents BfR points out that, in accordance with the Chemicals Act, doctors in Germany are bound to notify the BfR Poison and Product Documentation Centre of any health impairments in conjunction with chemical products.