Many times I have seen fresh render or concrete painted only to see it peeling off one year later. I have always wondered what it was that they did wrong. Does anyone have experience of this?

Rednadnerb wrote:

Many times I have seen fresh render or concrete painted only to see
it peeling off one year later. I have always wondered what it was
that they did wrong. Does anyone have experience of this?

No, but if you're looking to avoid it, or future re-painting, you could
look at self-coloured silicone render such as K-Rend

On 17/03/18 07:36, Rednadnerb wrote:
Many times I have seen fresh render or concrete painted only to see it peeling off one year later. I have always wondered what it was that they did wrong. Does anyone have experience of this?

used waterproof paint.



--
€œA leader is best When people barely know he exists. Of a good leader,
who talks little,When his work is done, his aim fulfilled,They will say,
€œWe did this ourselves.€�

ۥ Lao Tzu, Tao Te Ching

On Saturday, March 17, 2018 at 8:08:04 AM UTC, The Natural Philosopher wrote:
On 17/03/18 07:36, Rednadnerb wrote:
Many times I have seen fresh render or concrete painted only to see it peeling off one year later. I have always wondered what it was that they did wrong. Does anyone have experience of this?

used waterproof paint.



--
€œA leader is best When people barely know he exists. Of a good leader,
who talks little,When his work is done, his aim fulfilled,They will say,
€œWe did this ourselves.€�

ۥ Lao Tzu, Tao Te Ching

I'd always use a pliolite paint. Expensive, but trivial in the big scheme. I can verify its longevity on an exposed SW facing wall

Well when they did my wallboards, they first knocked off the blown render,
replaced it then sealed the joins with some kind of darker coloured stuff,
then they sprayed the whole lot with a special bonding layer of paint. It
had to be done when there had been no rain for a time and left to dry well
before applying the other coat.
A few years earlier, I had a cowboy outfit do a part of my back wall with
the same product and it all was coming off like dandruff two years on. I
know they did the under coat just after it rained.
So maybe its not so much how they do a job but when they do it as regards
the weather.
Brian

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Blind user, so no pictures please!
"Rednadnerb" wrote in message
...
Many times I have seen fresh render or concrete painted only to see it
peeling off one year later. I have always wondered what it was that they
did wrong. Does anyone have experience of this?

On Saturday, March 17, 2018 at 8:46:16 AM UTC, Brian Gaff wrote:
Well when they did my wallboards, they first knocked off the blown render,
replaced it then sealed the joins with some kind of darker coloured stuff,
then they sprayed the whole lot with a special bonding layer of paint. It
had to be done when there had been no rain for a time and left to dry well
before applying the other coat.
A few years earlier, I had a cowboy outfit do a part of my back wall with
the same product and it all was coming off like dandruff two years on. I
know they did the under coat just after it rained.
So maybe its not so much how they do a job but when they do it as regards
the weather.
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Rednadnerb" wrote in message
...
Many times I have seen fresh render or concrete painted only to see it
peeling off one year later. I have always wondered what it was that they
did wrong. Does anyone have experience of this?

I think the main feature of the pliolite paints is that they can be applied in the cold and wet, important in industrial applications

On Saturday, 17 March 2018 09:07:28 UTC, stuart noble wrote:
"Rednadnerb" wrote in message
...
Many times I have seen fresh render or concrete painted only to see it
peeling off one year later. I have always wondered what it was that they
did wrong. Does anyone have experience of this?

I think the main feature of the pliolite paints is that they can be applied in the cold and wet, important in industrial applications

I've used Dulux masonry paint & it's still been good 20 years later. At the other end of the cost scale lime paint lasted, I forget but after 10 years or so it was rather stained & needed redoing. It's espsecially quick & easy to use.

The others I've used, pliolite & household gloss, have been less sucessful. Pliolite was the worst, flaking heavily after 2 years on sound concrete. From Screwfix. HG works reasonably well, but its imperviousness is a problem.. That is probably true of dulux & pliolite too.


NT

Mmm. There are a lot of conflicting experiences here that makes me think that it is the render that determines how long the paint lasts. Maybe not dry enough, too much lime or something?

On Saturday, March 17, 2018 at 8:44:05 PM UTC, Rednadnerb wrote:
Mmm. There are a lot of conflicting experiences here that makes me think that it is the render that determines how long the paint lasts. Maybe not dry enough, too much lime or something?

Call me old fashioned but I don't trust water based paints for critical applications
https://www.macphersontrade.co.uk/pr...mooth-masonry/

Rednadnerb posted
Mmm. There are a lot of conflicting experiences here that makes me
think that it is the render that determines how long the paint lasts.
Maybe not dry enough, too much lime or something?

We used ordinary Sandtex masonry paint, which has now been there for
three or four years without any sign of flaking. We let the new render
dry for two years before painting it.

--
Jack

On Saturday, 17 March 2018 20:44:05 UTC, Rednadnerb wrote:
Mmm. There are a lot of conflicting experiences here that makes me think that it is the render that determines how long the paint lasts. Maybe not dry enough, too much lime or something?

FWIW the concrete I put the pliolite on was over a century old & as solid as rock. And it was scraped & cleaned totally before painting.


NT

On Sat, 17 Mar 2018 13:44:03 -0700 (PDT)
Rednadnerb wrote:

Mmm. There are a lot of conflicting experiences here that makes me
think that it is the render that determines how long the paint lasts.
Maybe not dry enough, too much lime or something?

I think it's mostly about how you manage to catch it, but then I read
the subject line as "Painting new reindeer".

In article ,
wrote:
I've used Dulux masonry paint & it's still been good 20 years later.

I'd say you've been very lucky. No masonry paint I've used here has lasted
even half that long.

--
*Until I was thirteen, I thought my name was SHUT UP .

Dave Plowman London SW
To e-mail, change noise into sound.

On Tuesday, 20 March 2018 15:58:16 UTC, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:

I've used Dulux masonry paint & it's still been good 20 years later.

I'd say you've been very lucky. No masonry paint I've used here has lasted
even half that long.

I'm certainly surprised. But equally surprised by the pliolite.


NT

On Saturday, 17 March 2018 07:36:14 UTC, Rednadnerb wrote:
Many times I have seen fresh render or concrete painted only to see it peeling off one year later. I have always wondered what it was that they did wrong. Does anyone have experience of this?

IME, cement based paints seem to work best.
I think the porousity of them stops water accumulating behind the paint,film,


http://www.concreteconstruction.net/...for-concrete_o

I have always used alkali resistant primer then 2 coats of masonry paint but on small areas. I need to do a large area and it is going to be roughcast.. The alkali resistant primer will be soaked up like a sponge and is very expensive. I am wondering if I can do without it.