Painting & Decorating

Paint coming off in sheets from new mistcoated plaster

Anonymous user 01/03/2024 - 2.56 PM

Hello, I did so much research and thought I did everything by the book, to my horror the paint just peeled away in sheets the following day. 1) Had the walls reskimmed, the walls dried and were very smooth almost marble-like 2) Waited about a month for all walls to dry, all light pink colour 3) Filled in any cracks, sanded down any imperfections, wiped all walls and ceilings free of dust 4) Sprayed the mist coated 50/50 Armestead contract matt + water, let it dry for a few weeks 5) Sanded down any imperfections again, wiped the dust 6) I used Tikkurila Optiva 5 matt paint to spray on the first layer. I didn't take off the masking tape at that point, just waited overnight to recoat 7) Put 2nd coat of Tikkurila Optiva 5, let dry 8) Started taking off the masking tape and the paint just dragged behind it 9) All the paint came off like sheets, what did I do wrong? #Hi John @ MacTaggart Renovations, thank you for taking the time to reply. I specifically chose a paint for mist coat which doesn't have any vinyl, I picked Armstead Contract Matt and diluted it 50:50. The layer was good enough and covered the fresh plaster well. The finishing coat was Tikkurila Optiva 5 which is acryl based so no vinyl there either. The bizarre thing is that Tikkurila comes off in sheets with the mist coat, but in some places mist coat remains and Tikkurila is harder to get off. Your comment about the Thin Coat made me think that perhaps the sprayer wasn't the best way to put on the mist coat in case the spray just landed on the plaster without actually "working it in" like a roller would? Thank you again! #Hi Timothy David Interiors, Thank you very much for your response, I will take a closer look at the reverse of the paint in case I can see any pink dust, but I didn't before, and as I mentioned, I wiped the dust, but with a dry cloth, so not wet which I suppose could have left some dust. I wiped the walls with the palm of my hand and there was barely a hint of whiteish dust, which could be from the mist coat. I will also invite a few other tradespeople to see if they can confirm if the plaster was too polished. I've started taking off the paint and mistcoat residue to hopefully get me back to bare plaster again, and I'm thinking of trying a primer this time applied with a roller to make sure this doesn't happen again.