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Old 26th September 2005, 02:32 AM   #1
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Default wipe / rub on photoresist?

Hi,

I have been making pcb with heat transfer method for a while but I would like to try something else in order to get finer traces. I've try using UV light method but I am not too comfortable with the equip. and material involved. The worst part of the story is the photoresist used. I used some pre-fab photosensistive board to get acquainted to the exposure time and develop time. Seems I have find the right procedure for them but I would now like to try out with home prepared photosensistive board

I don't like the pre-fab board because they never come at the right size with your design and you cannot stock them at home for long period.

I've try using some spray on from Electrolube but I think I've made a real f***ing mess out of it. If I am holding the jet too close to the board, I will get bubbles within the green areas. Further I don't have a dark room and when I try to do it in my bathroom, I almost got choked to death.

Is there anything like rub-on or wipe-on for these photoresist? It would be very kind of you if you can share with me the source for such material.

Thanks
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Old 26th September 2005, 07:21 AM   #2
Did it Himself
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The sprays aren't very good. How long do you want to stock boards for? I've used 18 month old stuff before and it's been OK.
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Old 26th September 2005, 08:52 PM   #3
Bone is offline Bone  United Kingdom
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Hi bigpanda,

Try SN100 SENO Photoresist Applicator available in UK from Mega Electronics. www.megauk.com. About 8GBP plus postage.

Works well!

Regards

Bone
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Old 27th September 2005, 03:00 AM   #4
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Hi richie00boy,

With all the wried size of board I am using, I'll dump a lot of waste. So I need an exact board (or close enough) before I process with the photoresis.

Bone,
Have you use it before? You have any idea is there is a minimium order for purchasing from Mega Electronics?
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Old 27th September 2005, 07:27 AM   #5
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I don't see your problem. Board is standard sizes and whatever size is available in non-coated is also available in coated, so you won't be wasting any less board by using non-coated.
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Old 29th September 2005, 01:49 AM   #6
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Hi richie00boy

For non coated board, I can always get a large board to be cut for several projects so that the waste is distributed among them. For coated board, it is not that easy to cut a smaller piece from a large one (may be doing something more such as smoothing out the edges before you can put the film on it ) in that kind of lighting condition.
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Old 29th September 2005, 10:27 AM   #7
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I'm still confused. I use large board and cut off what I need, piecemeal style, month by month. You simply cut through the film. A normal small hacksaw does the job fine. Tidy the edges up when you need to use the image film on it, they clean up fine with the protective film left on, if you rub a file across/over the film side edge.
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