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Solder Resist methods?

Discussion in 'Electronic Design' started by Jon Slaughter, Oct 19, 2007.

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  1. Anyone have any ideas how to go about this for home etching? I'll probably
    etch a board or two today and was thinking it would be better if I could put
    some resist on it. Things I'm worried about are actually finding the stuff
    quickly(What kinda stuff could I pick up at wallmart that might work, for
    example) and applying it properly. I don't need anything fancy but I guess
    just something that will protect potential short circuits across traces and
    probably something that isn't impossible to remove incase I need to add a
    jumper. I'll need to be able to apply it either before the components are
    soldered but somehow leave the pads exposed or apply it after soldering.


    Just popped into my head that maybe finger nail polish would work? Maybe
    dilute it some and then apply it?

    Thanks,
    Jon
     
  2. Probably more expensive though...
     
  3. Guest

    http://dkc3.digikey.com/PDF/C073/P2071.pdf
     
  4. Rich Grise

    Rich Grise Guest

    Are you talking about that green stuff that da prose use? I'd think
    it's silk-screened on; I don't know what the goo is, but maybe try
    googling for "solder resist ink" or "solder mask" or something.

    Good Luck!
    Rich
     
  5. robb

    robb Guest

    i was just recently looking into solder resists as well ...

    i had thought of using some kind of colored clear coat {enamel,
    acrylic} spray paint you find at local automotive stores. Most
    auto-stores also carry **high heat** spray paint for engine
    temps and in colors other than black like transparent colored
    clear coats {blue, green, red, etc } i have yet to test these
    and do not know of conductivity ??

    while searching for ideas i came across a diy-audio site that
    talked about using Testors spray enamel paint (again a
    transparent colored paint , so one can see through it)

    and the site also mentioned "pebeo vitrea 160" ink for glass
    painting it is cured by 150-160 degrees F

    if you search that with "resist" you will probably find thr
    thread about it

    hth
    robb
     
  6. Guest

    Depending on the density of the circuit, you can get away with using
    silkscreen as solder-mask, just draw thick lines perpendicular to the
    traces to prevent the solder from wicking. YMMV.

    Solder mask can be "LPI", it is imaged the same way as the copper
    artwork. This is done to achieve 1 mil accuracy of the solder mask.
    Cruder designs can use silkscreen solder mask.

    For hand repair, use MG Chemicals #4190-GP.

    http://dkc3.digikey.com/PDF/C073/P2071.pdf
     
  7. D from BC

    D from BC Guest

    At first read ..(and the coffee hasn't kicked in)..I'm still hazy..
    Are you looking for solder resist (post title) or etch resist?


    D from BC
     
  8. John Larkin

    John Larkin Guest


    That would probably melt when the solder hits it. Some
    higher-temperature stuff would be better.

    If you're hand soldering, you don't really need resist.

    John
     
  9. Gary Peek

    Gary Peek Guest

    That is exactly what I have been doing for many years. Combined
    with a paint brush with only a few hairs left in it and you can
    paint a _very_ fine trace.

    The polish dries quickly so you will need to continuously dilute.

    I start out with dry-transfer component patterns (like DIP) and
    paint from there. Lacquer thinner to dilute, and to remove after
    etching.

    If you get messy and overpaint, wait 10 minutes to dry and scrape
    it off with a fine point X-acto knife.
     
  10. No no, I mean as a solder resist or maybe better said as a "final" coat. Not
    an etch resist but to coat the copper after it has been etched.
     
  11. I'm worried about shorting out the first because I used copper pours. If a
    wire drops across anywhere its bound to short out a bunch of things. I'm not
    worryed about the heat because infact I probably need to coat it before I
    solder(it would be easier) and I don't have any easy way to protect pads.
    (so if it comes off with soldering then thats actually ok)
     
  12. Solder. I've already etched and want to prevent any shorts.
     
  13. Maybe try Future. Just a thought.

    Best regards,
    Spehro Pefhany
     
  14. Yeah, I found it. I'm still doing some research. I don't really want to bake
    the board for a very long time I'm thinking of just patching over any pads
    and dipping it in some type of enamel or something. I'll probably need to
    make a few trips and figure out what I could use. I think probably anything
    that isn't conductive will work(although might not be very scratch resistant
    but I'm not to worried about that)
     
  15. Guest

    I think you're confusing terms here.

    A final coat is called a conformal coat. This goes over everything.

    If all you want is to coat the copper to prevent it oxidizing and to
    keep it solderable, you can use liquid tin.

    The usually green coating you see on real PCBs is called the solder
    mask.

    The stuff you draw on home made PCBs to prevent etching is called
    resist.

    The legend or lettering or service print or refdes is called the
    silkscreen.
     
  16. Essentially. Doesn't have to be green and isn't silk-screened. Its just
    dipped or sprayed on and there are many variations. But I'm sure there are
    many products out there that can be used for DIY. The only real issue is
    that its non-conductive.
     
  17. Rich Grise

    Rich Grise Guest

    FWIW, I've always heard that referred to as "solder mask". That might
    google better thatn "solder resist".

    Good Luck!
    Rich
     
  18. D from BC

    D from BC Guest

    Ahh...
    I've never done this but maybe try to thin out hardware store silicone
    with xylene.
    BBQ paint might work too. It's got silicone in it..
    Engine paint too has a high temp rating. Maybe pop into a store with
    automotive products.
    Apply by syringe, brush, stencil, screen, spray, roller, spin, dip
    etc..


    D from BC
     
  19. I might have got the terms mixed up but I'm pretty sure I've seen it called
    solder resist too(along with a few other names). Both names don't seem to
    make much sense though.
     
  20. I think I might try some polyurethane or some type of spray paint...
    probably goto the store soon and see what I can find.
     
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