Circuit board sealent anyone?

[John Garza (3665)]

Every once in a while, I get the urge to visit the non-HP machines in my collection.

I have 3 operational TI-59s (100%op including card readers), and 5 non-op in various failure modes.

The most common fault is card R/W failure due to corrosion/failure of the mag card op-amp and associated capacitors. This happens even with a known good card reader installed. Sometimes the corrosion runs up the ribbon cables to the card reader and you have a mess on your hands.

I'm starting a project to get another 2 or so 59's up to spec. Though I never keep batteries installed, I'd like to increase the reliability. To that end I'm thinking that after I replace components and remove all corrosion, to seal the boards. This should reduce/eliminate corrosion.

Has anyone tried such a thing on calculator circuit boards? I'd like to know what I'm getting into.
Thanks!

-J