Hi ya'll!

We just got a rework job in from a customer where we're gonna change a PLCC28
out for them, remove it and replace it with another. The board has been
conformal coated with an Acrylic conformal coating (Humiseal type 1B73 I
believe...).

I know reworking can be done just by burning through the coating, and then
cleaning up the pads real good before putting the new part back down. We're
water soluble, so we're gonna have to run the boards through the cleaner to
clean the flux residues...and I know that we'll damage the coating when
putting it through the cleaner. On the boards that I've looked at, the
coating has been compromised anyway on spots here and there just from the
handling...acrylic is not too tough.

I told our customer that the coating was gonna be pretty raggy looking when
he got the boards back from us, and we're not in the conformal coating
business. But what's bothering me, is that I think they've got some spray
cans and they're gonna try and touch-up things themselves...against my strong
recommendations. I think the boards should be stripped of the coating that's
on there now, baked, and then re-coated.

But like I said, we're not in the conformal coating business, and I've not
worked much with the stuff anyway. I'm just thinking logically about it...am
I sweating things too much?

Thanks!

-Steve Gregory-

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