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Marking copper

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dave greenham	23/08/2013 09:56:14
100 forum posts	Hi guys i have a few leaks on a 4" copper boiler. Can anyone tell me how I can mark these leaks so that I can still see where they are when the copper is hot enough to solder? tried layout fluid, scratching with a scribe. But all disappear when the boiler gets hot. Any ideas please regards dave
Russell Eberhardt	23/08/2013 10:29:58
2785 forum posts 87 photos	Tipex? It can also be used to restrict the flow of the silver solder. Russell.
dave greenham	24/08/2013 11:11:14
100 forum posts	Thanks Russell id forgotten about that. Dave
fizzy	28/08/2013 19:30:50
1860 forum posts 121 photos	You can just about see black marker pen
dave greenham	28/08/2013 19:39:35
100 forum posts	Thanks guys Russell. Yes the tipex worked fine. That's the leaks sorted at one end , so I intend to have a go at the other tomorrow . I think some of the problem with the leaks was air pressure building up in the boiler and not getting away at the bottom fast enough. Thus blowing pin holes at the top. I raised the boiler up on some scraps of steel and that seems to have sorted it but won't really know until the other ends done. Then I can pressure test it. very many thanks all of you regards dave

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