It's high summer here in the Mediterranean with outside shade temperatures hovering around +35C, and the inside temperature around+30C with 40% humidity. I am trying to wallpaper and am running into problems.
The rooms are an old stone farmhouse, solid 800mm thick walls plastered with lime plaster in good condition that has then had several coats of emulsion type paint on top. The walls are VERY dry.
I have prepared the walls, filling cracks with Policell, rubbing the walls down and then giving them two coats of Bison universal size. Everything else comes from Screwfix.eu.
I am using Eufurt Red label 1400 grade lining paper and Solvite professional extra Strong paste, mixed at 7 liters of water to a 185gm packet. I had tried 5.5 liters, but that made the problem worse, so I suspect it is to do with absorption/evaporation rate.
The problems happen 36 to 48 hours after pasting, when the edges peel away from the wall, generally taking several layers of paint (green), still stuck to the paper, with it, but leaving more layers of paint (cream) still on the wall. For 24 hours or more, the joints are perfect.
Can I repair and get the but-edges flat again using decorators caulk, or use Solvite or perhaps something else? Is this heat related, because of the hot ambient temperatures?? Stripping the paint is not a realistic option.
Any suggestions about what I am doing wrong AND how I can fix the lifted edges without taking all the lining paper off would be appreciated. Thanks for reading
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