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Sealing connections is (IMO) best done using Coax-Seal or Scotch 2228. They are self vulcanizing rubber tape products that are specifically designed for permanent weather proofing. Amazon is a source, Home Depot stocks the Scotch 2228 in the electrical department alongside ordinary electrical tape.
I seal with 2228 and then over-wrap for dirt and UV protection using a good grade of common electrical tape. Electrical tape alone will not seal permanently.
You can also use weather tight electrical junction boxes if you like, but the cost and convenience factors favor the sealing tape solution.
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