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I don't use flux on my boards. If you do you need to make sure you are using the right kind of flux. For boards like this I like to use this solder

https://www.amazon.com/gp/product/B00AYJ0B7Y/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

It flows really nicely and doesn't require the use of flux.