On a sunny day (Tue, 26 Jun 2018 11:08:57 +0000 (UTC)) it happened Martin
Gregorie  wrote in :

>I do all light mechanical soldering with a 56g copper iron with a wooden
>handle heated over a gas ring. I use Baker's Fluid as the flux and clean
>the iron with Bakers fluid and a small file. Simple. Traditional. Works
>every time.
>
>If you need to do this type of soldering, the gory details are here:
>
>https://www.gregorie.org/freeflight/soldering/soldering.html

Thank you, nice article.
I used S39 acid for soldering copper pipes.
NEVER use acid for electronics work, it kills capacitors etc.

I did the water pipes with a Black and Decker 1400 W hot air gun...
or was it a called paint stripper?

https://www.google.nl/imgres?imgurl=https%3A%2F%2Fi.ebayimg.com%2F00%2Fs%2FMzJY
MzI%3D%2Fz%2FkcoAAOSwix9ZkunY%2F%24_86.JPG&imgrefurl=https%3A%2F%2Fwww.gumtree.
com%2Fp%2Fhot-air-guns%2Fvgc-black-decker-1400w-hot-air-paint-stripper-heat-gun
-with-4-piece-
nozzle-kit%2F1261454696&docid=TFfysrLNkTicEM&tbnid=k4F9hmhM33RYPM%3A&vet=10ahUK
EwjK64WtxvHbAhWECOwKHdx_A6AQMwh4KAAwAA..i&w=1024&h=765&bih=854&biw=1670&q=black

Used a small metal thing in front to bounce the heat back, made it of alu.
like

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