Ive used sillicone sealant before in blocks and never had problems.... I wouldnt trust sillicone for the WHOLE block like you are though, but as its one-peice you shouldnt have many problems if it stays together. How strong are the sides?
Another way you could have done this is using resin/body filler for the sides and top, and not having anything over the chips except for a non-conducting layer of paint or something...?
I still think just cooling the MOSFETs would have been enough, the capacitors and other components dont make any heat themselves but they are absorbing it from the mosfets, as Cptn. Foo Foo said.
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