Homebrew PCBs

Haven't tried that but I doubt it would make much difference. The coating 
has to be covered with either a protective sheet or the mask itself, and the 
material flows quite easily under pressure. I find that the pressure of the 
glass exposure frame forces most of the material out to the edges, leaving a 
very thin coat (exactly what I want). A fairly small drop would be enough 
for most any size board if not for the fact that some will be trapped in the 
holes and enough is needed to ensure complete coverage without any bubbles 
before the frame is closed. Most of it ends up as waste, but even so, it 
doesn't take much. I bought 100 grams in each of three colors and I expect 
that will be a lifetime supply. I have not noticed any deterioration from 
sitting on the shelf. On the other hand, I've never used any guaranteed 
fresh, so for all I know I might be amazed how much better it works.
--
Phil M.

----- Original Message ----- 
From: "cunningfellow" <andrewm1973@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, June 30, 2013 5:20 PM
Subject: [Homebrew_PCBs] Re: shelving vinyl toner transfer


> >Phil wrote:
>>
>> <SNIP>
>> The key to success with the solder resist
>> seems to be getting as thin a coat as you
>> can use. The UV does NOT penetrate very
>> deep at all. I've taken finished boards
>> and placed them in the Arizona sun for
>> half an hour and was still unable to cure
>> the ink where it was too thick.
>>
>> <SNIP>
>
> Phil,  Have you tried using a silk screen
> too apply it?
>
> (A blank screen that has no diazo/pattern
> on it)
>
>
>
>
>
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