# Next challenge: the proto shields

**URL:** <https://forum.arduino.cc/t/next-challenge-the-proto-shields/886981>\
**Category:** General Guidance\
**Created:** [July 19, 2021, 11:43pm UTC](https://forum.arduino.cc/t/next-challenge-the-proto-shields/886981 "2021-07-19T23:43:26Z")\
**Posts on this page:** 1\
**Showing post:** 36

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**Author:** ![LarryD](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/larryd/32/215550_2.png) [@LarryD](https://forum.arduino.cc/u/LarryD)\
**Post date:** [July 25, 2021, 6:47pm UTC](https://forum.arduino.cc/t/next-challenge-the-proto-shields/886981/36 "2021-07-25T18:47:40Z")

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FYI

> [@Share tips you have come across](https://forum.arduino.cc/t/share-tips-you-have-come-across/428745/471):
>
> Making a high-quality Flux applicator. A 2 in 1 White-Out bottle makes an excellent flux applicator tool. These bottles have a spring-loaded metal point that seals off the contents when not pressed. clean out the old white paint with IPA. cut off the applicator brush at the location shown. rinse bottle and cap with Varsol. once again, clean the assembled unit with IPA until no white is seen in the alcohol. Let dry, then fill 3/4 full of liquid flux. You can easily apply a single drop of fl…

 ![B](https://europe1.discourse-cdn.com/arduino/original/4X/1/d/9/1d982a980c22920e25602e2eceacd05122b86047.jpeg)

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 ![2017-01-05_22-29-45](https://europe1.discourse-cdn.com/arduino/original/4X/c/9/d/c9d4432963eec696dbcefa0afb1707352af60929.jpeg)

Don’t forget the IPA too.

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