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Yes you can.
OS = Opti-Seal BFWD = Blackfire Wet Diamond.
If I'm right your be fine but wait 24 hrs before laying BFWD on top of OS. Their both sealant's and need some time to cure on the surface. You don't need anything in between them.
I'm a Blackfire Wet Diamond guy.
Both are great LSP's to use, like I said I'm a Blackfire guy.