Pcb insulator

Hi And thanks for reading this thread

What do you use as an electrical insulator for pcb solder pads.


I have a few solder pads very close together and want to insulate them to prevent a possible short. I am hoping there is a pen-like device which i can use to mark the pads, so when whatever is in the pen dries, it form a layer of insulation.

Thanks
 
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