Homebrew PCBs

Why not try a 5 second search on Google?

http://www.staticspecialists.com/techspray.html

   Didn't mention a word about it being the film mask on a board, you've clearly 
never been around an electronics production assembly environment, everyone uses 
this stuff.  While much of it is synthetic now to avoid the smells and for later 
water dissolve, natural works just fine regardless of any nay-saying, certainly 
good enough for a basic test.  Still reasonably pliant after preheat and 10 or 
12 seconds in a 700 deg solder bath since it peels in one piece, it's not nearly 
as weak as you're suggesting.

Alan



milwiron@... wrote:

>  Hi Alan,
> This is an area I don't know much about, how production boards are made. I buy 'em but I really don't know details of the process.
>  From every production board I've seen the solder mask appears to be an epoxy of some sort- single part, two part, UV cure, etc. Anyhow, it's a clear tinted thermoset plastic material, my guess is epoxy.
> 
> I've seen natural liquid latex rubber used for peelable paint masks but nothing that resembles latex rubber on a PC board.
> For a couple of seconds max. natural latex rubber could take the heat but not for much longer unless it's a sacrificial coating.
> With hundreds of newer, easier to handle and non-shrinking materials why would anyone use liquid latex rubber as a solder mask? 
> Just curious, thanks,
> Denny
> 
>  On Wed, 18 May 2005 12:20:34 -0400, Alan King wrote:
> 
>>>> Hi Stefan,
>>>> Liquid latex dries/cures in to an unvulcanized rubber, the
>>>> toner would bond right to it... if it was ever able to get past
>>>> the heat in the printer.
> 
> 
>> Now don't go jumping to any crazy, non-scientific conclusions
>> there.  Most solder mask is pure liquid latex, and survives 700
>> degrees wave soldering, so of course it will survive a fuser.
> 
> 
> 
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