So, for a hobby project I have a scrap of old phenolic circuit board with traces carved out with an X-acto knife. It's providing a power switch and a pushbutton.
It's been working well enough to turn power on, but if I leave a 150mAh LiPo cell connected to the input, even with the thing off, it was draining the battery dry.
Today I measured the resistance and it was around 50k-ohm. I scrubbed the thing thoroughly with isopropyl alcohol, and now, aside from an apparent surplus of capacitance, it shows resistances in the megohm range
-- but still not infinite resistance.
So I'm wondering -- is this a known problem with phenolic boards? Is it because the thing spent some time in the exhaust stream of a model airplane motor and got splattered with castor oil? Or is it something else?
I'm wondering how much I should be worried now that the thing is cleaned up.