I've got a circuit board that is known to have bad solder joints and I would like to reheat some joints and try to coax some life from it. However, half of the board is covered in a red substance.

A) Most likely, what is the red stuff?

B) Should I remove it before attempting the soldering?

C) How (can?) it be removed?


Thanks!

 

It is called a Conformal coating and it used to protect the circuit board from the effects of moisture, dirt, chemicals etc. It is usually used when the circuit is to be installed in a harsh environment like a car engine compartment or in a generator. You can solder through it and use a de-soldering pump to remove the solder. Apply some varnish to cover exposed joints when finished.
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