From: Viacheslav Slavinsky
Subject: Re: Problems with using Aerosol Photoresist
Date: Sat, 30 Nov 2002 12:04:24 +0300
Organization: WEBPlus Ltd.
NNTP-Posting-Date: 30 Nov 2002 09:03:51 GMT
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.1) Gecko/20020826
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> Has anyone out there had any success in using the Electrolube PRP positive
> photoresist for making PCB's. I understand this product has changed
> recently from an easy to use blue chemical, to the current green
> formulation. Can any one explain to me the steps involved in getting this
> newer product to work, the type of UV lamp used, developer etc.
From the description, it seems to be the same, or very similar to,
photoresist that I have here. It's still purple and can be developed in
caustic soda. I guess the only way to get the right exposure is
experimental, I heard that properly exposured areas should look a little
brighter than unexposed in side light. On my first try I went with a
seriously underexposed board and it was a real pain to develop it, but
somehow it made out well and with help of a marker I could finish the
board. I don't know characteristics of my UV lamp so no real advice
What I'd like to hear is how people use their wits to make a THIN and
UNIFORM layer of this fabulous fluid on their boards. Here it seems to
ignore all cleaning and degreasing and forms annoying spots on the
surface, unless the layer becomes really thick, which is not good.