On Dec 30, 10:30*pm, "Mr. Land" wrote:


I'm working on a small PCB [on which]
manufacturer chose to glue [something...]
The glue is a yellowish-white and very, very tough. *It seems very
much like the glue I've often seen used to glue larger components
I've tried:
* - PCB cleaner (Electro-Wash)
* - Denatured Alcohol
* - Flux Remover

...none of these seemed to affect the dried glue at all.

The PCB cleaner and denatured alcohol are exactly what the
mass produced circuit board was cleaned with at the factory, of
course; no surprise that the glue didn't come off with them.
Flux Remover can be any number of things (Freon? Methylene chloride?)
but you'd have to look at the label to tell.

I'd try paint thinner (or other naptha solvent), and acetone/ketone
(like
lacquer thinner), or even just a hotair blower and a brass-bristle
brush.
Those solvents are flammable, of course, so no sparky blower motors
while they're in play!

Methylene chloride (old-fashioned paint remover) might still be worth
a try, if you have proper ventilation. And then maybe toluene or
heavy alcohol (like glycerine).