Get a drill and drill lots of small holes by the edge of the laminate. Then get a large chisel and knock out the holes. This will give you the gap that you need. It takes ages though and you need to be careful you don't drill down too far. It's not hard though.
Nick
November 2009
You have to leave expansion at edges.The reason it is buckling is because it dont have enough space to expand with change of seasons.The sealant you used might be keeping it from expanding like a glue.Other wise floor need more expansion.
John
November 2009
Floor needs to move - expand / contract - buckling due to lack of expansion gap - latex sealer will not be helping.
Live with it as it is or lift it and relay with adequate gap - there is no other solution.
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Try fixfault.com to fix laminate flooring.