I haven't built my big fixture yet but I see on RC that some people use a spray on sealer that Luxeon makes for their stuff. There was quite a debate about it on the DIY forum.
Take a look at Luxeon's website as I'm sure they list the spray there. It's clear and you apparently cover everything facing down at the tank (including heatsink and LED's).
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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