Getting differential diagnoses The purpose of the glue is to anchor the capacitor to the PCB so that it does not break off with vibration/drops. It looks like the application is not ideal in that case since there is very much glue on the capacitor and little contact between the glue and the PCB.
The adhesive is needed to prevent the capacitor vibrating (the leads acting like a spring) and moving around when device is subject to external forces. I’m looking for something like DOW CORNING 744 WHITE Adhesive, RTV Silicone or WACKER Silicone Adhesive Sealants (WACKER Silicone Adhesive Sealants - Intertronics) Take a look at these options.
Hi Michael, I think we misunderstood each other. The capacitors are leaded components that will be soldered through holes in PCB. The adhesive is needed to prevent the capacitor vibrating (the leads acting like a spring) and moving around when device is subject to external forces.
there is a glue for electronics,i use silicon for mirrors. For axial caps I use mainlyclear silicone, as per Fender. For radials usually hot-melt. Depends on the proximity to other components, though. You don't want hot-melt softening under heat if its close to a hot component.
The only saving grace is that the board I'm thinking of is vintage 1986 or so...no SMCs. Still, yeah....might be better to pay to have it done. Electrolytic capacitors have a rated life, typically 8000 hours which is only about 1 year, based on being on 24/7. However, that's at rated voltage and rated temperature, typically 85 or 105 degrees.
The problem is, in old age the health of electrolytic capacitors becomes more and more a matter of statistics. How a part has been manufactured (chemistry, seals etc.), how it's being used in circuit, how the device has been used and stored over its lifetime and sheer pot luck can make a huge difference after a few decades.