Etching new galvanized metal with Ospho

[gs1949]

I'm all done. All the galvanized is painted.



Toluene, as in trinitrotoluene, right? No thanks. I'll pass on that.



We once found 10 pounds of that in the woods, in a little old shed near a waterfall we hiked into, but my dad would not let us play with it.

[kidharris]

Originally Posted by Sleddgracer

to pass industry standards, untreated galvanized steel surfaces need to be washed down with toluene before painting - you might prefer to stick to wiping with vinegar after reading about the safety precautions needed to be taken and the possible nasty effects on human health - when painting galvanized steel doors in a hospital renovation, we had to set up a low air pressure area to be sure not the faintest whiff of toluene could be detected outside of the work area

https://www.worldofchemicals.com/422...p-reactor.html

How do you set up a low pressure area?

[Sleddgracer]

Originally Posted by kidharris

How do you set up a low pressure area?

seal off the area using plastic and duct tape, then use a fan to drive air through a large ventilation pipe to the outdoors - that creates a one way air floow - when you open the door to the work area, air rushes in rather than out - keeps dust from leaving the work area as well

[Sleddgracer]

Originally Posted by kidharris

How do you set up a low pressure area?

https://www.norseman.ca/en/portable-temporary-ducting

[kidharris]

Originally Posted by Sleddgracer

https://www.norseman.ca/en/portable-temporary-ducting

So... seal an area off with plastic sheet, than set up a fan inside blowing into a duct going outside?

[HazMatt]

The opposite of working in a confined space, which you forcibly vent fresh air into the containment area via a 2' flexible hose & high velocity fan.

[Sleddgracer]

Originally Posted by kidharris

So... seal an area off with plastic sheet, than set up a fan inside blowing into a duct going outside?

that's the idea - simple when you see it in operation