I go into a hardware retailer and ask for "conformal coating please".
I'll get a funny look !
Google lists only one supplier of a 3M coating, all the other offer a coating service.
Searching for conformal coating at uk.farnell.com reveals a wide range of coating options in various amounts to suit small scale and larger scale projects.
That's why I start looking at the problem differently. Guard rings on the PCB of a motor controller that will be used outside? Sure, it can be done. But, it's easier to not go above 1M unless absolutely required.Then the fun begins: guard rings on the pcb and/or PTFE standoffs; long integration measurement times to cancel hum etc.
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