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In my testing I have found that the joins are waterproof but to combat any oxidization, you can use head shrink tape or sleeves to reinforce the join. You can also glue the heck out of the wire.
Hot Glue Solder
Presentation: Final Model, Drawings + Renderings
Ideation: Brainstorming & Sketching
Iteration: Prototyping & Testing
Starting a Handmade Business