I would like to ask if anyone of you knows what is this glue added in some power supplies or generators. Please give me the name. Thanks a lot. See attached photo.
Yes, look for that or potting compound, pretty much all electronics suppliers sell it. Check it is that first, 'though. If it is covering a circuit/a, or some, components it probably is.
Sorry, didn't see your last post earlier. In case you haven't already searched yourself, this search came up with several things, one of them called How to Unpot an Electronic Device looked interesting.
Not sure what tools you have to hand. I've never done that, it looks quite difficult, but is clearly possible. Good luck.