I'm having troubles with capacitors that leak current. For example in the range of 10uF to 1000uF. I soldered good quality 470uF in a circuit at 5V and the leakage current is 0.1mA, that is too much.
The old capacitors could recover themself. When not being used for 20 years, they recover a little when a voltage is applied. It seems that newer ones don't do that.
For a 1uF capacitor I used ten 100nF ceramic types, and sprayed pcb fixer over it, so dust can't cause a leak. Result : no leakage current at all.
When I measure the leakage current, I end up using old capacitors. But I don't know if they will last another 10 years.
What is reliable for 10 years with minimal leakage current ?