That will depend on the type of coating used as there are many, some of which are trivial to remove whereas others cannot be removed without using means that irretrievably damage the circuit board itself.
However assuming you are referring to the common green varnish coating used on most commercial circuit boards, this can be removed with an ordinary paint stripper chemical that is effective on varnish and an acid brush. Just make sure to wash off the stripper residue with good quality circuit board cleaner (not water).
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Taiwan has good quality circuit boards. So, you can get circuit boards from there.SHARAN
You can find a printed circuit board design online in some blogs or message boards that are interested in designing circuit boards. You can also find some designs on websites that sell kits and circuit boards.
the answer is the mother board of the computer
Soldering iron, solder, flux
The hard black dot on circuit boards is a drop of epoxy placed over small integrated circuit chips. The epoxy is specially formulated to draw heat away from the IC and is essentially a tiny heat sync for the chip.