Am Freitag, 6. Oktober 2017 12:25:31 UTC+2 schrieb David Billington:

Here is a venting guidance video from Wedge Galvanising
http://www.youtube.com/watch?v=C8EGUlerwVg , it include brief footage of
what can happen when an unvented items is dipped and it bursts.

By the way, I was told lately that galvanising sticks better if the steel surface is slightly corroded. Anyone know if this is true?