Newton's Rings: [sdiy] solvents/cleaners for flux

[Cynthia Webster]

on 8/13/03 9:07 PM, Glen at mclilith at charter.net wrote:

> At 11:17 PM 8/13/03 , Cynthia Webster wrote:
> 
>> I hold them so the the liquid will drain straight down onto the ground, and
>> after the first scrub they're usually a bit sticky, so I repeat the whole
>> process and the boards come out very clean and professional looking
>> however after flipping the boards around... this results in rainbow Newton's
>> rings type patterns on the ~component~ sides,  which look like someone's
>> poured lighter fluid or gasoline on them!  (Not a good look)
> 
> Is the component-side mess caused by tilting the boards so much that the
> chemicals run around to the component side?
> 
> Perhaps instead, you are having trouble with chemicals passing through some
> unused, or only partially filled, component holes?
> 
> Once we know the route the chemicals take, we might be able to invent a
> solution for your problem.
> 
> 
> later,
> Glen Berry

Hi Glen!

Well, I usually hold the boards perpendicular to the ground,
(the same orientation as the hand of a traffic cop saying "Stop!"

Holding the board parallel with the ground components down doesn't
seem to solve the problem either.

I've even tried just spraying only the brush itself, but that in not enough.

I think the solvent curls around the four outside edges onto the other side?

Some kind of an airbrush artist's friskette?  (sp?)

Your post made me think a little, and perhaps a solution solution, :)
might be to saturate a large sponge with the liquid, and simply set
the board (rosin side down) on top of the sponge for a couple of minutes?

Like a jumbo version of those postage stamp wetting sponge jar thingies
from offices past.

Does anyone know of a brand of flux remover that evaporates completely
cleanly?   This is PureTronics brand flux remover spray in a blue spraycan