[sdiy] DIY soldermask coating?

[Speth, John]

> I've got some long single-sided PCBs I got from the downsizing
> maintenence dept. of a audio visual studio. (Someone suggested
> they
> might be spare buss bars for an old mixer).  Each has 4 long
> copper
> traces with several sets of holes spaced across the 4 traces at
> 0.156
> intervals ( just like MOTM-format power connections). I plan to
> use
> them as ±15V power distribution boards, but would like to be able
> to
> insulate the large unused copper areas of the traces, leaving just
> a
> small area of copper under each hole for soldering pin headers on
> to.
>
> Anyone know of a relatively tough spray-on, or paint-on electrical
> insulation coating that won't react badly with bare copper?
> doesn't
> matter if it's opaque or transparent, but it has to do the same
> job as
> the solder-mask coating on the solder-side of commercial PCBs.

Not spray on but bulletproof if the geometries are right: heat shrink tubing carefully cut and placed to allow for shrinkage.  I've seen up to 3 inch diameter tubes that shrink down to about 50%.

JJS


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