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painting lettering onto marble - which paint for outdoor durability?

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Phil K

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Jul 7, 2015, 8:07:57 AM7/7/15
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GD, all,

I am about to paint some black lettering onto a slab of marble. Can anyone
recommend a paint that will stand up to the weather and be resistant to
scratching off? I only need a very small amount of paint - about an eggcup
full...

Many thanks,

PK

newshound

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Jul 7, 2015, 8:25:36 AM7/7/15
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If you don't get an authoritative reply here, I would be inclined to
drop in to an undertakers. They may refer you to their monumental
masons. You might even find they would give/sell you a small quantity.

Adrian

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Jul 7, 2015, 8:29:12 AM7/7/15
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On Tue, 07 Jul 2015 13:25:34 +0100, newshound wrote:

> If you don't get an authoritative reply here, I would be inclined to
> drop in to an undertakers. They may refer you to their monumental
> masons. You might even find they would give/sell you a small quantity.

Headstones tend to have the paint within carved lettering, though - and
even then it'll flake off after a few years.

The Natural Philosopher

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Jul 7, 2015, 9:30:54 AM7/7/15
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I would suggest an epoxy/polyester resin loaded with pigment and forget
'paint' as such.


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Dave Plowman (News)

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Jul 7, 2015, 10:24:23 AM7/7/15
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In article <XnsA4D085D...@130.133.4.11>,
Phil K <p...@xxdd44.com> wrote:
> I am about to paint some black lettering onto a slab of marble. Can
> anyone recommend a paint that will stand up to the weather and be
> resistant to scratching off? I only need a very small amount of paint -
> about an eggcup full...

A decent oil paint straight onto clean marble will be fine. As I know from
trying to clean splashes off...

--
*Why do we say something is out of whack? What is a whack?

Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.

Phil K

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Jul 8, 2015, 4:37:57 AM7/8/15
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The Natural Philosopher <t...@invalid.invalid> wrote in news:mngkac$the$2
@news.albasani.net:

>> If you don't get an authoritative reply here, I would be inclined to
>> drop in to an undertakers. They may refer you to their monumental
>> masons. You might even find they would give/sell you a small quantity.
>
> I would suggest an epoxy/polyester resin loaded with pigment and forget
> 'paint' as such.

That's an option I had considered. Anyone advise where I can but a very
small amount of black resin pigment?

Does anyone know of an etching primer that works on stone? I remember using
some kind of yellow etching primer back in the 1980s that was supposed to
work on both steel and GRP. Dunno if it would etch stone though. Thanks to
all for the input.

PK

Brian-Gaff

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Jul 8, 2015, 4:43:50 AM7/8/15
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One has to becareful with Marble as some paints contain an etchant which can
eat into the marble itself.
Don't have any marble here this was at a place of work.
Brian

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"Phil K" <p...@xxdd44.com> wrote in message
news:XnsA4D085D...@130.133.4.11...

Phil K

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Jul 11, 2015, 6:08:28 AM7/11/15
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"Brian-Gaff" <bri...@blueyonder.co.uk> wrote in
news:mninpf$5en$1...@dont-email.me:

> One has to becareful with Marble as some paints contain an etchant
> which can eat into the marble itself.
> Don't have any marble here this was at a place of work.
> Brian

Hi Brian, I would have thought that if the paint etched itself into the
marble, that would be a good thing as it would improve adhesion, but, hey,
what do I know?

I found a tin of enamel paint in my garage t'other day. It is called
Plasti-Kote quick-dry enamel. It's a few years old, but when I opened it,
it looked as liquid and new as ever. Does anyone have any experience of
that stuff? To my surprise, it turned out to be water-based. It doesn't
mention that on the tin; you only find that out when you try and rinse your
brush with white spirit! I've used water based gloss indoors before with no
problems, but not sure if this Plasti-Kote enamel would be a good choice
for my marble job. It's not quite as opaque as, say humbrol oil-based
enamel. I wonder how it would stand up to a few years of sun, wind and
rain.

I'm going to be engraving the lettering into the stone, prior to painting,
so that will hopefully improve longevity.

PK

newshound

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Jul 12, 2015, 3:24:52 PM7/12/15
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I'd wondered about etch primers; the usual formulation is phosphoric
acid, and that will neutralise itself by dissolving some of the marble.
But they are *really* designed for use on metal: you get a phosphate
layer which helps to protect the steel against rusting. You won't get an
analogous beneficial effect on stone. I'm with TNP that epoxies sound a
good bet.
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