Join Date: Feb 2012
Location: New Orleans Louisiana
Thanked 137 Times in 131 Posts
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Re: Rebedding skylights
Butyl or life caulk work great.
Try finding the manufacturers recomendations and see if there is a requirement to flatten or shim the hatch if installed on a compound deck.
Take some neat epoxy and seal any core in the area. Better is to dig out about 1/2" around the instillation of core, and replace with thickened epoxy. Same with fastener holes.
Don't over tighten the fasteners.
If installing on top of non-skid, knock it down a little. If installing in smooth glass, rough it up a little.