Red oxide and spray paint

[Rich#1984]

How long will red oxide and spray paint last on fences or would it be better to spray galv then spray paint normally I would hot dip but the person doesn't want holes drilling in the framework

 

[steveo3002]

modern red oxide is just red primer , no lead content like the good stuff from years ago

 

[Ross365]

As above, the term "red oxide" now refers only to the colour of the paint, which now has no lead oxide content, which acted as a corrosion inhibitor

 

[steveo3002]

and poundland red oxide wont perform as well as £100 a tin stuff

 

[nickk]

I use Jotun red oxide which has a zinc content,I buy in 5l tins at £25+vat.

 

[Ross365]

I use Jotun red oxide which has a zinc content,I buy in 5l tins at £25+vat.

Just looking at the data sheet, it actually has zinc phosphate in it; zinc phosphates kicks ass, though I uses Johnstones. The paints that contain metallic zinc tend to be more expensive.

 

[Olderisbetter]

I use Jotun red oxide which has a zinc content,I buy in 5l tins at £25+vat.

Seems a good price, is it a trade counter or website you use

 

[nickk]

Seems a good price, is it a trade counter or website you use

I just phone my order in,Elmbridge in Gloucester,they charge £10delivery.plus vat .

 

[maroon]

i've been doing some googling... as you do. and i was wondering....
if you were to restore a car from upto 1992 would that be applicable to the "specialist" use of red lead?
would "historic england" allow the use?

apparently it CAN still be used. but only for historic restorations. needing to apply to use it.
i think, from what i've gathered

 

[Ross365]

Well, the first question you'd have to ask is whether of not lead oxide does a better job of inhibiting corrosion than, say, zinc phosphate, or any of the other modern formulations? I don't recall ever seeing any data on that.

 

[steve t]

Try a zinc phosphate primer/finish available in a few colours

 

[fizzy]

Well, the first question you'd have to ask is whether of not lead oxide does a better job of inhibiting corrosion than, say, zinc phosphate, or any of the other modern formulations? I don't recall ever seeing any data on that.

Modern bridge coatings - usually epoxy with metal powder followed by a PU topcoat last 20 to 30 years. So no more painting the Forth bridge all the time - if that actually happened or was it always a myth?

 

[Seadog]

I believe that it was true. But with the advent of modern paints it's now something like 25 years.

 

[fizzy]

I believe that it was true. But with the advent of modern paints it's now something like 25 years.

They painted some motorway bridges at J44 of the M4 back in 1993 - remember them doing it. Paint still looking good although a few rust streaks starting to appear now. Remember Wales gets loads of rain and lots of road salt used so a pretty harsh environment.

 

[Ross365]

Modern bridge coatings - usually epoxy with metal powder

Would that be micacious iron oxide? Never used any of that paint but it's full of large thin flakes of iron oxide ("large" in the microscopic sense) and the reason why it's supposed to be good is that water molecules have to navigate their way around the flakes. So suppose the paint layer is 100 microns thick, the water might have weave its way along a path of say 200 microns to get the underlying metal. There be other factors involved too.

It's a pity that none of the really big, high-tech paint companies have any interest in selling to the DIY car paint market, so we all have have our favourite paints, but largely based on personal experience rather than technical expertise.

 

[Dcal]

How long will red oxide and spray paint last on fences or would it be better to spray galv then spray paint normally I would hot dip but the person doesn't want holes drilling in the framework

For gates and railings, blast clean, then two coats of epoxy mastic and one or two coat of PU top coat.
If it's inland it will easily last 30 years before needing another coat of paint.

You could go with zinc rich epoxy first, but I don't think it will really be needed.