You absolutely do not need to buy a UV torch.

But I really like using mine to ”lume up” my watches with my new toy. 

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Buy some UV glue now. Stuff is so strong they use it on teeth.

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The time it saves in charging up luminescent paint will pay for itself in no time!

https://www.harborfreight.com/uv-blacklight-flashlight-63931.html

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Looks fun!  

What is the actual use beyond lume charging?  

Certainly it can’t be just for us geeks to make our watches into glow bombs ?