Are they re-usable? Can I re-use it to connect a different set of wires later? Thanks.

As mentioned, some of the Dielectric grease is displace by the wires and pressed into the wires. If you are adding one more wire to the bunch, I see no reason why you can't reuse in this case as you are adding mass to the cavity. If you want to be anal, you could add more Dielectric grease to the nut and wires (after twisting them) prior to reuse of the wire nut; cost is about $0.50 per nut if you are considering material cost. But in a pinch, if you run out of nuts, you can add Dielectric grease to finish the job.

Does the silicone inside harden over time to help keep the wires inside tight and contained? Thanks!

No the silicone in the wire caps are like Vaseline never gets solid. I have a jar of Vaseline that is around 50 or so years old and it's just like they we bought it.

ASIN	B0046735LO
Brand	Rain Bird
Brand Name	Rain Bird
Colour	Green
Connector Type	Crimp
Contact Material	Copper
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 1,002 Reviews
Global Trade Identification Number	00077985013370
Insulation Material	Nylon
Insulation Material Type	Nylon
Item Weight	0.01 Ounces
Model Number	N90300
Temperature Rating	150 degree celsius
Terminal	Ring Terminal
Terminal Type	Ring Terminal
UPC	077985013370

Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors, 10-Pack

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