Having never used these before and having to de-rust a large steel plate
with modest pits, what is the most suitable grit size I should use?
This is for a 4.5" / 115mm angle grinder.
I also got the impression the finer grit sized wheels last longer?
Can anyone assist with pros and cons?
On Tuesday, 20 December 2016 22:58:30 UTC, Mike Perkins wrote:
Wearing out is not an issue with flap wheels, they seem to go on forever.
They work well, fast and leave the metal with a "bright" finish but also leave the surface with a rough "adzed" finish".
You can't get into corners and crevices with them.
A wire "cup brush" is bit better in corners but doesn't leave a bright finish. It gets the surface rust off but the metal is left with a sort of brown film. Needs "Kurerust" or similar treatment prior to painting.
Most two-pack epoxy paint suppliers suggest that wire-brushing is more
likely to polish rust than remove it.
In the past I have used wire brush attachments and I am inclined to
agree with this observation.
My instinct is that a flap wheel will be more aggressive with rust?
I'm surprised, but open to persuasion. Most of my experience is on
fairly badly pitted rusty metal, on this my feeling is that a wire
brush will tend to get further into the pits. In general if this is
the first stage of 'rust treatment' then whether the surface *looks*
good isn't very important, what matters is if the 'paint' applied
after can penetrate to solid metal.
I had a rusty sunroof on the old Rover. One of the few panels you can't
Sanded it down to bare metal, then used a Dremel type thing with a diamond
burr to grind out the pits. Then lead filled it. It cost 100 quid to have
it painted, so wanted the paint to stay on as long as possible. ;-)
*Eagles may soar, but weasels don't get sucked into jet engines *
Dave Plowman email@example.com London SW
It gets the surface rust off but the metal is left with a sort of brown
Needs "Kurerust" or similar treatment prior to painting.
Kurust is now a useless product since it was been bought by Akzo Nobel
(new owners of Dulux), and reformulated as water-based.
get it professionally shot blasted if at all possible and then
paint or spray with zinc-rich primer immediately.
Akzo Nobel also now own hammerite and have turned that into
just another paint. Previous formulation needed Xylene to
clean the brushes. New version doesn't, and is nowhere near
as good as it was. In fact you'll struggle to find any decent
metal paints these days.
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