PCBs

Photoresist Spray

evandude said:

anyone had good luck with spray-on photoresist? Is it reliable, and does a can cover enough board to make it any more economical than buying presensitized boards?

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I have used photoresist but find pre-sensitised to be far less fuss. The photoresist has too many variables, thickness, spread, possible dust contamination, developing time, and shelf life of spray all play a part. However I have had lots of good boards from this method. I now prefer to use presensitised but keep a can of spray for when I am out of pre-sensitised.

As for Economy, I think it just appears to be cheaper, in the long run, with the time factor and re-runs, it works out more expensive and clumsy for me.

Perhaps someone could help with a few more tips?

does anyone sell this spray-on stuff in the USA? I didn't see it at my normal mail order places.