Has anyone tried this on metal outdoors? I have some iron railings I want
to paint and the Hammerite paint I use keeps lifting with rust every 12
months so I thought I might give this a go. If anyone has tried it what is
the finish like?
This is fine for iron railings but you have to give up the idea that you can
keep rust at bay with anything short of galvanising, or keeping them oiled.
Although there are many products which allegedly cure rust I doubt if there
is anyone other than the manufacturers who finds that they work.
Bitumen paint finish is quite reasonably glossy, although not as glossy as
real gloss paint. I'm sure you'll find it OK.
The first question is, why is the hammerite is failing? Rust loves a
supply of air, water & metal(!). Assuming you're completely cleaning
down the surface first, then you should prevent rust with hammerite -
providing that the surface is completely covered. This includes
corners and edges, which tend to be weak points which can be tricky to
cover with paint. You may need to put down multiple coats to ensure
complete cover. Also, if you dealing with a tricky surface, try
applying Hammerite No1 Rust Beater before applying the topcoat.
Bitument paint may work, as it provides a good barier to water.
However, you could end up with the same issues as you have with the
hammerite unless you prepare the surface properly and coat the metal
completely. You may also need to apply a zinc-phosphate primer before
application of the bitumen paint. The zinc in the primer works in the
same way as galvanising. It can prevent rust creeping along the
surface, should rust get started in a particular point due to a film
Thanks for that guys,
The reason the rust keeps coming through is that the cross beams that the
railings actually go through, both top and bottom, holds the rain water
after a downpour, the rain rests on them in balls of water, the railings
themselves are fine. I need something that is completely waterproof to try
and stop the rain water penetrating the paint. I am at the moment getting
the cross beams to bare metal where they have bubbled up and applying Red
Oxide paint (2 coats) before giving the bitumen paint a go. in hind sight I
agree that Galvanising would probably be best. What do you think of
Johnsons water seal or something like Scotch Guard after I have painted
them? Can I paint over this stuff at a later date if I need to? Questions,
Questions, Questions lol.
OOps! Bitumen does not adhere well to red oxide.
I used to have a narrow boat whose hull was painted with bitumen based
paint. During a dry-dock I decided to paint the areas around the waterline
with red oxide and found the bitumen lasted about as long as it took to
apply. I was told this before I applied the oxide and decided I knew better,
to my cost!
Bitumen is initially bright in finish but soon settles off to a dull grey
I did paint one boat with black gloss on top of the bitumen, which looked
quite smart between dry-docks, the two paints seemed to get along quite well
The cheapest source I found for "bitcho" was Wilko, the Midlands hardware
type store. The Wilko chain may be elsewhere in the country also.
Thanks for that James, I was going to buy some Bitumen pain tomorrows from
Wilko's but as I have already painted the fending with Red Oxide I'll take
your word for it and not put the Bitumen on top if it doesn't stick to it
and I'll go back to the Hammerite.
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