Cleaning copper
2002-03-03 by Russell Shaw
Hi all, To make spray-on prp resist work well, the copper has to be cleaned well. Some things that work: salt and vinegar, salt and lemon juice, citric acid, and probably lots of others. I like citric acid the best, as its ok to use in the kitchen. Mix up 30-50% powdered citric acid (sold in supermarkets), with hot water until disolved. Wiping it over the pcb blank with paper towel is sufficient to degrease it, without any harsh scrubbing needed.