Flux pen (e.g. <
http://www.techni-tool.com/Search?search=kester+flux&gclid=CJD_ksLH5bQCFcU-MgodPF8Axw>) or just paint some on from one of the gallons should provide similar protection. Some day I'll get back to doing circuit boards.
Donald.
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----- Original Message -----
> From: "chris" <chris@...>
> To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
> Sent: Sunday, January 13, 2013 9:15:07 AM
> Subject: [Homebrew_PCBs] Re: No HASL
> Rick,
>
> FWIW I gave up tinning the boards after I started using this
>
> http://www.rapidonline.com/Tools-Equipment/PCB-flux-spray-30093
>
> so my process is now
>
> print toner transfer on laser printer
> use laminator to fix toner to board
> chill in water
> remove carrier paper
> etch
> (The boards can be stored indefinitely at this point)
> drill (easier to see the holes when the toner is still on the board)
> clean off toner with stainless wire wool or 260 wet and dry
> rinse and dry with paper towels
> spray on flux as above
> (the boards can be stored indefinitely at this point
>
> assembly
>
> spray boards with acrylic sealant
>
>
>
> I did some tests and although it is recomended to wash off the flux
> before coating with conformal coating, I didn't find it made much
> difference to longevity of the boards in automotive environment.
>
> Chris
>
>
>
> --- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber" wrote:
> >
> > I was playing around with some scrap pieces of circuit board I
> > etched and
> > drilled in order to find a way to simulate the HASL (Hot Air Solder
> > Leveling) process. This process puts down a very thin coat of solder
> > over
> > the copper. The solder protects the copper plus makes soldering in
> > components easier.
> >
> >
> >
> > I found that I could brush the board with flux. Then I built up a
> > small bump
> > of solder on the ground plane. Using my soldering iron as a paint
> > brush, I
> > dipped into the bump and then painted the copper. When done, I
> > scrubbed the
> > board with alcohol. Worked great. I had no shorted paths.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Rick
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
> ------------------------------------
>
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> Photos:
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>
>
>