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We have just started using a similar type of setup. The sealing films I have found to not really seal all that well, either from Corning or Griener. I have gotten reasonable results using the Manco Tape packing tape that is typically used for other sitting drop trays.
We've had excellent results with the ClearSeal Film that Hampton sells (not sure who the original manufacturer is). The pressure-activated adhesive works reasonably well and is harder to make a mess of - and the "windows" above the wells remain (mostly) chemically inert, which I haven't found to be the case for regular tape. It's also simply much clearer than anything else we've tried.
The only problem is it's so expensive ($2 each, or something ridiculous) and removing the film from a plate often destroys it, so I try to be conservative in my use of 96-well plates.
(On a related note: does anyone know of good 96-well microbatch plates compatible with a multichannel pipetter? The tiny 72-well plates are terrific but I want something that's easy to set up, and I've given up trying to make the Impact plates work.)
-Nat
