Boss Supergreen inside heating pipes

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Hi, I'm part way through having a boiler installed, and in a main valve and another compression joint my heating engineer has used a LOT of green goo that I think must be Boss Supergreen. There are gobs of it inside the ends of the pipe and in the valve. Like, you could make a cube of it 1cm on each side, kind of thing, in a 35mm pipe.

It's not water soluble of course, immediately anyway, and it seems to me you wouldn't want it in your heat exchanger. What do you think? A problem or a non-issue? I can fix the joints but wondering how bad a sign it might be.
 
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How did it get in there ?
My young heating engineer! He's taken a break while some late parts arrive and I picked up the valve he'd fitted then removed. It was full of the green goo, so I undid another joint, to the filter, which is the one in the photo.
 
He is doing something wrong somewhere
Yes, thanks for your input, it's given me the confidence to do something about it. Looks like I might have tried a bit too hard to support a local lad starting out.
 
Boss white smears nicely round the pipe in front of the olive - and smells - he will go home smelling like a proper plumber . Not to be used on potable water pipes nowadays;)
 
Yes, thanks for your input, it's given me the confidence to do something about it. Looks like I might have tried a bit too hard to support a local lad starting out.
To be fair to the lad if he is just starting out, so many so called tradesmen still put flux inside fittings , before soldering, he has probably been showed to do that by someone who hasnt a clue, good that you are giving the lad a chance
 

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