I have never had to use a 'house wash' before and not had that happen, but it does look like you have a mould under there. Would be interested to see what others think.
debmus,
Feb 24, 2:45pm
We pre paint wash before every exterior repaint, you need to remove the environmental contaminants.
maclad,
Feb 24, 2:56pm
Probably not a lot of help, but, I painted my window and door frames, (exterior) and did all the prep properly and within 3 years all the paint was flaking. Turns out it was because of the matai/totara timber they were made of and I needed to use a sealer paint under the topcoat. So if your house is older this could be a consideration.
johotech,
Feb 24, 3:24pm
It's pretty hard to tell from the photos, but it does look like you needed better preparation as well as possibly specialized undercoats before you applied the top coats. Often that is what's required for render that is already been painted and has existing problems.
It should be able to be fixed, but I don't think you can simply blame the paint.
shanreagh,
Feb 24, 4:00pm
One of the pictures (4th) looks as though it has unsealed render with lime in it. i had a brick/mortared then rendered back porch on my 1905 wooden villa and did usual prep for a wooden house but the paint bubbled up and I was told had it needed a sealer to seal the lime from coming out of the render.
I have always washed the walls down very thoroughly as part of wall preparation.
redden39,
Feb 25, 8:00am
I stripped the windows right back and did use Dulux Prepcoat before applying two coats of Weathershield. Touch wood, the windows appear okay. Other parts of the walls are okay, it's just some that are failing badly. I have painted weatherboard houses before and never had a problem. This is my first stucco, maybe that makes some kind of difference. I read the instructions and asked for advice before painting. Weathershield is self-priming so I didn't see the need for extra undercoats etc.
blueviking,
Feb 25, 9:27am
Looks like there's mould under the paint. As you put more coats of paint on, this gets heavier on the original coats and sometimes you find that as the top coat heats and cools it moves the coats underneath to much which causes them to crack. After this many years all the leeching would have occurred and the only way you would get more is if moisture was getting in behind somehow.
redden39,
Feb 25, 10:25am
There is mould forming under the paint once the surface breaks. One part I waterblasted earlier stunk as it was so green. Ironically, this is an area where the new paint is staying on.
pauldw,
Feb 25, 11:12am
My father had a lot of trouble over the years with acrylic over the limewashed stucco on the family home. He blamed it on the tallow his father added to the limewash to make it look whiter in winter. Various repaints tried water blasting and sealers. I think the eventual solution was a complete wirebrushing to remove as much of the lime as possible.
lythande1,
Feb 25, 12:02pm
Looks like bad preparation to me.
mac934,
Feb 25, 5:14pm
Resene lumbersider sticks to anything,wood concrete,bricks,steep.Wouldn&#- 39;t use anything else.
brighteyes16,
Feb 26, 8:13pm
Maybe a moisture problem. Is it a south side wall by any chance?
mrsglaucoma11,
Feb 27, 5:03am
Is it failing along the bottom of the plaster walls?
redden39,
Mar 3, 12:14pm
The worst fails are on the side that gets all afternoon sun. Does anyone have any idea what's best to do next? I expect it will involvbe waterblasting. I have consulted Dulux but they were not at all helpful.
maccachic1,
Mar 3, 1:48pm
Houses are not designed to be waterblasted. Low pressure hose is the only water you should be using.
Have you even looked at the problem area in the op's pictures?
redden39,
Mar 5, 9:07am
I am a self-taught amateur. I've only ever painted weatherboard houses before. When I waterblasted, it took almost all of the paint off of the front and this is a side that is still looking okay. It's the side where the old paint didn't seem so loose that has gone the worst.
siobhan41,
Mar 5, 9:27am
Neighbours house has done very similar and theyhave had 3 goes 3rd being a pprofessional painter. they are being told that moisture is coming from the inside out and causing it to bubble.
redden39,
Mar 6, 12:59pm
Interesting. My home isn't damp inside and we have had hot dry weather with no rain for ages here.
jkp58,
Apr 30, 5:26pm
after waterblasting you must let the timber dry properly before applying paint.A moister meter is the only true way to know how dry the timber is'A product called peel bond may be of use to you .Bunning s has it.Google it
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