Here is how I prepare a board. All of the following is done while wearing
rubber gloves:
1.) With a new, clean paper towel, scrub the board with Comet or Ajax.
Wash thouroghly with water and remove all cleaner residue. Dry the board
with a paper towel.
2.) Rinse the board with acetone to remove any oil residue that may be on the
board (This is probably your problem from the description you gave). Dry
the board.
3.) Apply photo resist.
If you air dry the board, you going to have some amount of dust that gets on the board. This can cause spots or bubbles. Therefore, I always dry the photoresist in a small oven to avoid this problem.
Best regards
Marvin Dickens
Alpharetta, Georgia USA
Scott Gordon <
scottG@...> wrote:
Hi,
I'm trying to print my first ever PCBs, but I'm having some problems with
the photoresist producing small bubbles
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