trying to touch up and fill in slight mishaps/gaps with DIY "laser jet" to PCB transfer resist ?
after the transfer ....
so i was wondering what to use to touch up the transfered resist trace image ? are there any "brand" ink/pigment pens at local office supply or corner drug that is known to work for this application ?
Nothing is better than just doing the iron-on over and learn from the previous attempt. Clean your copper with a scrub pad thoroughly and iron with more heat and pressure, use the top edge of the iron. The paper your using may not have the right finish.
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For a little touch up, I have had the best luck with Bic Wite Out pens.
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Black markers can work but the results are nothing to write home about.
yea, i tried three times and the first was the best go ???
i am trying a double sided board which is the real trouble as the
2nd heating messes up the other side's etch mask. i tried putting paper towel, then tissue paper but it still causes problems i think i maybe moving the board slightly and that is trashing the resist lines.
christ>Nothing is better than just doing the iron-on over
Agree. Don't get in a hurry. Prep is critical. Use a Green Meanie and detergent. Rinse and dry thoroughly.
He may may not have the iron quite hot enough but otherwise either of those may tend to just spread out the toner. Again, I would say "Don't get in a hurry". Too short a dwell time with the iron is what I found to be my initial problem. LIFT the iron to move it.
Don't get impatient taking off the paper/plastic either. Let it cool completely first and be gentle peeling/removing.
The stuff for Xerox copies seems like a natural match. I used nail polish I got at the 99c store and cut the brush bristles at a steep angle to get a point.
I found them completely unsuitable. The ink was just too thin.
I've used Staedtler permanent OHP pens successfully for many years for 'simple' hand drawn PCBs and touching in blemishes in photoresist after developing. Also used them with PCB transfers (anyone remember them!)
Works for me. So far I've done four or five PCBs with a Sharpie. Helps to go over and re-ink the pattern, I've had one with somewhat spotty tracks- looked like wood grain.
Tim
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