I did as well and had to remove it, scrape gasket, build a new gasket and resilicone. I wasn't thin or heavy with the sealer but gave particular attention around the bolts on the inside by giving them a little extra.
I haven't run the engine for as long as I did during the test runs so I'm not 100% certain it's 100% leak free yet. Once my wiring harness is in, I'll retest.
