Sealing wire wheels with silicone

installing new tires and want to seal the spokes at the hub so as to prevent grease from leaking out. what is the proper method and silicone?
just finger wipe across the inside?

That’s what I did. Easy peasy.

Just make sure to clean that surface with acetone or lacquer thinner, first.

That’s a good idea. One more thing to do this winter.