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Removing the protective varnish from the PCB

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frantisek:
Can anyone please advise how to remove about epoxy protective varnish from PCBs of Russian measuring instruments? Thanks!

magic:
Ordinary soldermask or conformal coating? Neither is very easy tbh.
What are you trying to achieve?

ogden:
Further reading: https://www.vaniman.com/ultimate-conformal-coating-removal-guide/. In short: epoxy conformal coating is worst case, you need set of preheating + ESD-safe microblasting equipment, right consumables.

frantisek:
Now I know how to do it without preheating!!

p.larner:
paint stripper works well+ a brush under hot running water .

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