[sdiy] [OT] UV solder mask vs JBWeld/Gorilla Weld

[Nathan Trites]

Hi Barry, based on your pic I'd probably use a small piece of aluminum,
phenolic PCB material, or acrylic cut just bigger than the patched area,
and use a quality double sided tape to attach the flex pcb to it. Liquid
electrical tape may be a more robust option than UV soldermask to
encapsulate after. You could even use some kind of epoxy and sandwich the
repaired area but I'd be worried about that causing stress as it cures, and
future access may be important?

Nathan

On Mon, Mar 7, 2022 at 1:16 PM Barry Klein via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Kapton tape doesn’t stick to itself (or anything really) very well. I need
> to form a firm surface as it can bend and tear.  Bending would break the
> jumper wires between the two pieces. Guys are complaining the green UV
> soldermask doesn’t harden well. If it is like the UV glued I’ve tried, it
> doesn’t adhere very well either.  Maybe even CA glue and baking soda could
> be an option…
>
> > On Mar 7, 2022, at 8:48 AM, Mike Beauchamp <list at mikebeauchamp.com>
> wrote:
> >
> > On 3/6/22 21:31, Barry Klein via Synth-diy wrote:
> >> Sorry for the OT post but I don’t frequent other electronics forums and
> am hoping some of you have experience with this.  I am repairing a torn
> flex circuit.  I have the hardest part done - I used wires from solder wick
> - twisted a couple together, applied solder paste on pads scraped clear on
> the broken traces, and have all jumpered across nicely.  But these wires
> have no strength. I have both flex pieces crazy glued to a thin metal
> base.  I intend to free them from it using a razor blade after I apply
> either uv soldermask or jbweld over the joints.  I’m afraid the JBWeld
> won’t adhere and afraid the UV solder mask won’t adhere or solidify.  Maybe
> it will harden if I use really thin coats but likely doesn’t adhere to the
> kapton.  Any advice?
> >
> > Can you laminate your repair with one or several layers of oversized
> kapton tape on each side and cut to shape appropriately?
> >
> > Mike
> >
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