Please give some more information: - How do the cases open? (Do the glass fronts slide out or are they lifted out of a groove?) - If you were to put a gasket material in the gap, would it show? (for instance, are there two overlapping pieces of glass in the front of the case with a gap in the center that would look bad if it had a seal or gasket? - What kind of objects are in the case? (It may not be a good idea to seal the objects for up to two years, as pollutants/contaminants from case materials or the objects themselves may cause damage - this could be controlled with a regular maintenance schedule, and perhaps a pollutant scavenger like activated charcoal, etc...) I would be happy to suggest some methods/materials if you could be a little more specific. I'm sorry to say that I missed the original post and didn't see who it was from. Please feel free to e-mail me directly regarding this. Best Regards, Scott Reuter > > We have an exhibit which will be up for another two years. > > We are looking for ways to make cases more resistant to > > dust infiltration. The cases are large, floor-standing > > style cases with glass fronts. The opening height is 7' > > and varies in width. The principal entrance of dust into > > the cases is from the gap between the glass panels. > > > > Any recommendations for ways to seal those gaps with an > > average width of 1/4"? Some space must be maintained > > between the glass in order to remove the panels for access > > to the case interiors. Exhibit Safety Services - Museum quality earthquake protection for works of art and antiques - http://home.earthlink.net/~reuter/