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When is black paint not black paint?.

Posted by davel-383163 - Created: 3 years ago
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10 replies (Showing replies: 1 to 10)

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Posted by AQ-417490 - 3 years ago

The reddish streaks issue was last discussed in March this year. If we are talking about reddish streaks running down the wall, then Freda is right. It is ferric oxide, caused by the iron salts in the sand used for the render, which leach out of the render after persistent rain. The iron salts oxidize inthe presence of water and the oxygen in the air, causing these unsightly (but harmless) stains, mostly on west or south facing walls which get most of the driving rain. Many houses in Brittany are protected with these walls being covered in slates, either left natural or painted to match the other walls.

The anti mousse preparations used to clean off the stains are diluted bleach, but any diluted bleach will do it. Whilst effective, this treatment can leave the wall looking a bit blotchy. A couple of coats of masonary paint over the entire wall fixes that and provides an effective barrier against the rain penetrating the porous render, thus preventing any further leaching out. UK masonary paint is guaranteed for up to 15 years, but this might be optimistic and protection  might be better assumed for 5 to 10 years.

Algae and lichens can sometimes be guilty, but these can be recognised by the more disparate spread of growth outwards from the algae sources, rather than the vertical streaks caused by ferric oxide.

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Posted by geegee42 - 3 years ago

Freda someone told me ages ago it was an algae and that is why there is so much anti mousse stuff about,but you may be right with some sands having a high iron content ,I took a look on the net and the red algae on render is indeed quite common in Brittany.

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Posted by geegee42 - 3 years ago

A lot of paint sold in the UK is made abroad ,sigma which is available over here from merchants for one arm one leg and two pints of blood is preferred by a lot of professionals ,dulux is also made over by akzo Nobel,ici make loads of paint brands throughout Europe, but I agree cheap French paint is not as good a quality as cheap English stuff,now the reason,french normally paint their walls with spirit based gloss not the emulsions we are used to,ceilings are normally plastered white with a very porous plaster of Paris based plaster that needs painting with a paint that soaks in and doesn't lay on the surface ,hence the milky wishy washy stuff,plasterboard is normally treated with sous couche before finish coats,they also had a tendency to paper walls with a fibreglass based material which is then painted,emulsioned walls were an English thing and the paint was formulated for gypsum based plasters which is less porous than the french stuff,French style always used to be wishy washy pastel colours whereas English style was bold coloured walls.

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Posted by Freda Checks - 3 years ago

Quote "the red that you see bleeding out is an algae"

In actual fact it is normally because the sand used for the render has not been sufficiently washed to remove all traces of iron. It is rust that shows through!

 

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Posted by Aliben-397416 - 3 years ago

Basically French paint is rubbish, why buy inferior paint at thrice the price, if we have to go to England for any reason whatsoever, we bring English paint back, for us and our French friends!

It doesn't mean to say we don't like living here does it?

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Posted by geegee42 - 3 years ago

They don't ,its pre coloured render and the red that you see bleeding out is an algae ,the coloured render is porous, the walls you don't see it on are painted,the exterior paint that you buy here containing resin is very good and better than sandtex,the cheap 10€ ten litre acrylic needs doing every year but is actually OK for internal walls,You do often find good paint in noz but when you see it in lidl grab it,aldi used to do it but have now changed suppliers and its not as good.

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Posted by tigre-979768 - 3 years ago

What about the exterior paint for houses over here? A new house is built and within a short time the red streaks start appearing on the walls, surely the french can sort this out, Dulux weathershield would probably be better, I can't understand why they still use an inferior paint on the houses.

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Posted by AQ-417490 - 3 years ago

Lidl seems to go from strength to strength. Their products, including food, are of good quality and keenly priced. Now - if a German company can produce good paint at a keen price, even though it is Germany that bankrolls the Eurozone, then it is difficult to see why inferior French paint is as pricey as it is. The difference in taxes  / social charges alone would not explain the price differential. This might have to remain one of life's mysteries.

It is a shame that there are so many run-down or even derelict properties around, though it would take rather more than a lick of paint to  restore them to a habitable condition. Having said that, there are a good many very scruffy properties around in the UK that need attention - and often not needing much more than a paint job - but no excuse there, given the price of UK paint.

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Posted by rance-781573 - 3 years ago

XLR, maybe the French could put the price of council taxes, put lower priced wines up and add, eating out, mustards, beers, pate and all those things that the Brits have come over to France on booze cruises to stock up with, or of course to stay here, then they could reduce the price of paint.

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Posted by geegee42 - 3 years ago

The french know all about what you need to do to stimulate the economy but seem OK with the way it is,have a look on your tub of dulux and see where its made,I've bought paint from 10€ a tub to 50€ a tub but never needed eight coats,a lot of paint is produced in France which means profit not tax ,but next time you see the German stuff in lidl buy a tub its as good as dulux,also a little while ago I bought some acrylic facade paint and thought I would see what it covered like on placo,the magnolia covered in two coats which at 11.99€ for ten litres ain't bad.