I was going to put up a photo, but thought better of it. I'll let you all know when it starts flaking in 1/2/3/4/5 years time. I'm expecting us to be playing in the Europa Cup by then.
I have painted plenty of rendered walls and rather than waste expensive paint for the wash coats give it a couple of coats of PVA. PVA is cheap and can be watered down to a 50/50 mix and still be effective to seal render and plaster.
New render will suck the first two coats of paint up like a sponge so it needs be sealed ie PVA.
A lot of the quotes refer to plastered walls and emulsion paint which can be a problem. Emulsion is a water based paint where as a good masonry paint won’t be. Your choice but PVA will seal render ready for exterior paint fine.
Once the render is dry it’s cured and is fit to paint. Wetting the render will allow the paint, assuming it’s water based to soak into the render rather than just instantly drying on the dry surface forming a skin and making it liable (almost certain) to peel. Dont be lulled into using a PVA primer. If you want to be ultimately professional then you could use a stabilising solution prior to painting but if it’s new render I wouldn’t bother. Use a good quality masonry paint. Get the paint from one of the specialist paint / decorating outlets like Dulux, Johnstone’s or Brewers. Buy Trade paint not the shizer you buy from DIY chains. 👍 Same for paints for inside your house. Trade formulations are far superior to the DIY paints.
If anyone tells you any different they’re wrong.
Sounds about right, for the 1st coat what % of water would you use to the paint?
I'm looking for expert advice here please not guesswork from amateurs like myself thanks. Google gives conflicting advice. I had the wall rendered 8 days ago and it had dried out, although yesterday's rain has left it damp in a few places. The plasterer said let it dry out (possibly a week), then wet it (which I don't get if you want it dry) before painting. Give it 2 coats and mix the 1st coat with 10%/20% water. Thank you kindly.
Is this wall built with a cement based mortar (as I'd assume) or a lime mortar?
If the latter, a lot of tradesmen have no idea at all how to deal with old materials and will repoint with cement and cover with plastic paints which will do nothing but blow the bricks.
I have painted plenty of rendered walls and rather than waste expensive paint for the wash coats give it a couple of coats of PVA. PVA is cheap and can be watered down to a 50/50 mix and still be effective to seal render and plaster.
New render will suck the first two coats of paint up like a sponge so it needs be sealed ie PVA.
A lot of the quotes refer to plastered walls and emulsion paint which can be a problem. Emulsion is a water based paint where as a good masonry paint won’t be. Your choice but PVA will seal render ready for exterior paint fine.
You dont need to seal it, the idea is to get the paint sticking to the wall not a film of glue. And good masonry paints are water based. Its a garden wall he's painting, there is no need to oil based paint there, I'd only use one if I had a house facing the sea.
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I'll let you all know when it starts flaking in 1/2/3/4/5 years time.
I'm expecting us to be playing in the Europa Cup by then.
find out the render system used and speak to their technical team.