Re^4: Always be learning - how a leaky pipe made me appreciate Open Source (OT) Sandpaper

[Anonymous Monk]

By the way, the secret to foolproof copper soldering, is always sand the copper surfaces, before applying the acid flux. Now most manuals will say "make sure the copper is clean", but it takes an experienced plumber to say sand them.

With what grade sandpaper? Are we talking 220 or 80? It makes a difference! :-)

[zentara]

Fine cloth-backed sandpaper is best, cut into 2"x4" rectangles. Get the inside of fittings too. Of course if you are lost on a desert island, some beach sand and spit in a hanky will work. :-)