Electronics > Beginners
Favorite way to apply rosin flux? And cleaning leftover?
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David Hess:
I have a spool of solder which has the organic "water clean" flux and it is definitely not worth using except in a production environment.  The same largely goes for "no clean" rosin flux which works acceptably on new parts and boards but it less satisfactory for rework and prototyping.
helius:
I agree, rosin based (mildly activated) fluxes in the ROM0 category are better to work with.
https://www.pillarhouse.co.uk/technology/choosing-flux-technical-article
KL27x:
I use a syringe applicator. A box of 100 syringes can be had for something like $20.00. Add 100 black plastic twist caps. Then you need 20 or so tapered plastic needles, because they eventually wear out (from twisting them off the empty syringe with pliers; rosin is good glue).

Lately, I stuff some Q tip cotton or whatnot into the back of the plastic needle and cut the tip to the size and angle I want. (In the past I was more fancy pants, threading some cotton string/twine through the needle with a knot and melting/squeezing the tip to lock it in. That's overkill.) The cotton is to prevent squirts and drips.

I fill 5 to 10 syringes at a time, using a modified plunger that doesn't stick in the rubber gasket too tight. Cap them off, remove the plunger, and put these reloads into a cup at my bench. When my syringe runs out, I remove the needle and the plunger and transfer them to the next syringe.

If unused for a long while, the tip will dry out, but pressing on the plunger will get it working again in short order. I clip the syringe point down onto the side of my microscope in a little HDPE spring clip mount where I can retrieve and replace it without looking away from the microscope.

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