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---OK I'm Wrong,,,partially,,,,on the sealant---Silicone OK (or Toyota FIPG).
In the machine shop I'd use my anerobic seal, but in your case I think you can only use the silicone. Here's why:
If you install the plugs with the cam cap loosened the silicone that you "wet" the plug with is going to squirt into the gap of the caps. Best to loosen them and wipe the silicone in. Book says try not to squirt out any onto cam shaft surface. I think if cam shaft surface has a film of oil on it you'll have no problem with that as long as it isn't an excessive amount that might get in an oiler hole.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.