Cranfield Posted February 21, 2017 Report Share Posted February 21, 2017 Some time ago I posted about an internal wall that had a shadow stain on it, I am now convinced it was condensation , but during the investigation I found there was no DPC on that wall, so I had a chemical injected system put in. Following the installation of this I was advised to use a diluted version as a sealant on the "affected" part of the wall, before repainting. Now I am getting the odd dark patch appearing which apparently can happen with PVA/silicone . My question is, how do I get rid of it ? Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted February 21, 2017 Report Share Posted February 21, 2017 Black paint? Quote Link to comment Share on other sites More sharing options...
R1nut Posted February 21, 2017 Report Share Posted February 21, 2017 Stain sealer Quote Link to comment Share on other sites More sharing options...
simjakcal Posted February 21, 2017 Report Share Posted February 21, 2017 Wallpaper........................stain gone Quote Link to comment Share on other sites More sharing options...
digger Posted February 21, 2017 Report Share Posted February 21, 2017 zinzer stain block. Means repainting the whole wall but it's good stuff. Quote Link to comment Share on other sites More sharing options...
Cranfield Posted February 21, 2017 Author Report Share Posted February 21, 2017 Stain block it is, thanks for that. Quote Link to comment Share on other sites More sharing options...
digger Posted February 21, 2017 Report Share Posted February 21, 2017 No worries. A decent undercoat will do pretty much the same but zinzer comes in smaller tins Quote Link to comment Share on other sites More sharing options...
WGD Posted February 21, 2017 Report Share Posted February 21, 2017 Zinsser Quote Link to comment Share on other sites More sharing options...
Cranfield Posted February 21, 2017 Author Report Share Posted February 21, 2017 No worries. A decent undercoat will do pretty much the same but zinzer comes in smaller tins I did have the suggestion that oil based undercoat is a good solution, but I thought it would need something a bit more conclusive. I will get some zinzer stain block Quote Link to comment Share on other sites More sharing options...
vampire Posted February 21, 2017 Report Share Posted February 21, 2017 I have always used 'damp seal' on anything thats like that. Just finished a job that involved rendering outside following dpc injection,that was last summer and as siad just finished inside of all external walls.When i first surveyed the property the customer pointed out a stain in the middle of the wall,finally found out during works that it was an area of lime plaster that had been left during bad renovation works. Quote Link to comment Share on other sites More sharing options...
team tractor Posted February 21, 2017 Report Share Posted February 21, 2017 I've seen decorators undercoat/ gloss walls covered in chip fat then emulsion it. Quote Link to comment Share on other sites More sharing options...
southman1 Posted February 25, 2017 Report Share Posted February 25, 2017 When a pipe went in the bathroom,put a big stain on the kitchen cealing,I let dry naturally then white closs,then emulsion,ok no stain marks Quote Link to comment Share on other sites More sharing options...
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