I have painted soffics and facia boards outide with an emulion undercoat and two coats of satin but 3 months later only on the back of the building it is flaking off can somone tell me why this is i made sure everything was washed down and scraped and sanded any loss paint before i started thanks
exterior painting
- Thread starter cks
- Start date
You painted it three months ago and it is falling off now?
It is now early April, so you painted in in early January? in England?
Wood needs to be dry. Unless you'd had an ususually sunny period,your wood will have been damp and the water will have stopped the paint adhering properlu; and as it forms water vapour in the warm weather, the steam will be pushing the paint off.
Start again in a dry spell.
A useful tip for external painting is "follow the sun" i.e. get up at dawn and prepare your tools and materials; after the sun has warmed the west side of the house and moved round a bit, paint the surface which is starting to be shadowed, and work your way round the house and do the surfaces after they have been warmed.
BTW you say "emulsion undercoat?" I hope you mean a water-based acrylic primer/undercoat, not really using up your left-over internal emulsion? And why satin topcoat? I'd use an oil-based primer, undercoat and gloss topcoat if I were you. Aluminium wood-primer is good for difficult surfaces. You can use a breathable paint system (all from the same maker) if you like.
It is now early April, so you painted in in early January? in England?
Wood needs to be dry. Unless you'd had an ususually sunny period,your wood will have been damp and the water will have stopped the paint adhering properlu; and as it forms water vapour in the warm weather, the steam will be pushing the paint off.
Start again in a dry spell.
A useful tip for external painting is "follow the sun" i.e. get up at dawn and prepare your tools and materials; after the sun has warmed the west side of the house and moved round a bit, paint the surface which is starting to be shadowed, and work your way round the house and do the surfaces after they have been warmed.
BTW you say "emulsion undercoat?" I hope you mean a water-based acrylic primer/undercoat, not really using up your left-over internal emulsion? And why satin topcoat? I'd use an oil-based primer, undercoat and gloss topcoat if I were you. Aluminium wood-primer is good for difficult surfaces. You can use a breathable paint system (all from the same maker) if you like.
thanks for your help but i have been informed by er indoors that it was in november that i did the painting and yes i did use matt emulsion(interior) but my mate said that would be ok as the other paint for the top coat (satin) said that it is for interior and exterior and why would it only be the back of the building to start peeling as it is quite close to trees and does not get loads of sun where as the front does and that seems ok
C
confidentincompetent
cks said:
At a guess I'd say the north side is permanantly damp soo the emulsion is now softening, the front will probably follow shortly now the drought is over, especially after overnight rain, the wood behind might be bare, the eaves might get wet/ damp and then sun hits it a/m. as john d says emulsion outside especially vinyl is a no no no!
Mind you! I replaced a garage door for a chap several years ago. I went mental when he undercoated it with emulsion
But was speechless when I came to repaint his house last year and it was ok. But that was metal 
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Other factors here too ...north side, near trees...could be that the surface had a layer of mildew or mould on it..
Emulsion on old gloss is a recipie for disaster any time...but outside..north facing woodwork, satin over the top..the emulsion may have been contract emulsion...
CKS paint doesnt peel by itself..there is always a reason..or a combination of reasons, gloss is a sealed surface, its shiny too...so subsequent coats such as emulsion dont have anything to bind to...the wood will still expand and contract with the weather..and the gloss will move with it...emulsion is too brittle and cant cope with that sort of movement.
Emulsion on old gloss is a recipie for disaster any time...but outside..north facing woodwork, satin over the top..the emulsion may have been contract emulsion...
CKS paint doesnt peel by itself..there is always a reason..or a combination of reasons, gloss is a sealed surface, its shiny too...so subsequent coats such as emulsion dont have anything to bind to...the wood will still expand and contract with the weather..and the gloss will move with it...emulsion is too brittle and cant cope with that sort of movement.
The sun does more damage to painted wood than any other of mother natures powers. To be honest i would try to dry scrape all of the matt emulsion painted areas and burn off all existing paint. Then rub down and seal with Dulux System Exterior Painting process of bare wood (3 stages). Also any damaged wood then replace with new prior to painting. Big job though but atleast its getting done correctly.
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