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

[Barry Klein]

Well guys, this went down in flames.  The metal backing did not play nice and it ripped in half again while I was trying to get it off. The JBWeld didn’t stick to it either. I could not get any kind of tape to stick to the kapton well. I used CA glue to glue a piece of toothpick over the junction, which seemed to hold. Then I used .02mm wire jumpers over it to each side. This wire is too vulnerable and after assembly the unit wouldn’t turn on, so one or more must have broken free.  I’ll get some thicker wire and try again but ready to buy a new front panel and be done with it.

Barry

> On Mar 8, 2022, at 7:27 PM, Nathan Trites <nathan at idmclassics.net> wrote:
> 
> 
> 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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