Outside our house is a small wall and a few years ago I have it a fresh bit of paint! No problems-all went well.
2 years later I thought I'd best do it again however after this I noticed that it started to stain and then eventually crack. Not wanting to start a huge job I just went over it again and thought nothing of it.
Again the same thing happened! (Doh!)
So knowing it was a bigger job than just a lick of paint I left it.
This year (about 3 weeks ago) I stripped the wall right back to the brick/sandstone/cement top. Scrubbed it and even did a few repairs to make it a bit smoother!
Then I primed it and eventually painted it with new and better paint.
However....the stains have started to appear again!! Anyone know what it is and how to rectify it? I assume I'll have to take it back to the brick again which I don't really mind if it solves the problem! But obviously would prefer not too!
Have attached a pic of the stains however more pictures can be added if it helps!!
Hi, I'm presuming that you used a water based paint. The most likely cause of the staining is a greasy or other non water soluble deposit on the surface you painted. You can spray over the staining with a Stainblock (Get in most D.I.Y. shops) or paint over the stains with any oil/solvent based paint, then repaint with the water based. Hope this solves it, Kneesworth.
Many thanks for your reply! That's exactly what I have done, I've gone over the water based paint and stains with an oil based paint! Once the sun comes back again (and it hasn't rained for a few days) I'll give it a brief sanding down and go over it with the water based paint once again! Minimum 2 coats!! Hopefully that should work. The oil based coat has been on a good few days so far and can't see anything trying to get through yet! Watch this space! Shall let you know! Thanks again for your response! Alex
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