Cracking & Chipping Paint on Newly Plastered Walls
I have a 100-year-old Victorian. In the front room, previous owners had patched the plaster and goughed a (what I'll call) "sort-of" texture on parts of the wall. Prefering a smooth wall surface, I got in there full with gusto, digging out the old plaster cracks down to the lathe, removing crumbling plaster, adhering loose areas back to the lathe with a glue injection technique and then scratch-coated (where applicable), brown-coated (also where applicable), and finally skim-coated the entirety walls. I applied watered down elmers at each step and a dollop of the same in each batch of plaster mix that I made (I was using powdered Dap "wall patch" plaster for all stages of the plastering). The end result was looking quite good! I was pleased with my new smooth walls...sort of shocked that it had all gone so well. And then we painted it...
We started with a PVA-based primer as recommended by the paint store, then a nice, contractors grade paint on top. The issue arose with the first coat of paint on the walls. The ceiling and upper walls (ceiling received only a skim coat) are in one color and there wasn't any issue. The walls however, started having small bubbles pop up under the paint/primer which, when sc****d off wet, went down into the skim coat of plaster. We stopped popping/scraping the bubbles while the paint was wet, but those areas and a few others are now cracking down through that top skim coat.
I have no idea where the fail is occurring. The plastering efforts were done over three months with at least four days of drying time after the final skim coat (so it should have been dry enough). Is it an issue with my novice application of the skim coat (a lot of that skim coat landed on old paint, about 15% on patched plaster, the bubbling is happening in both areas)? A problem with the combo of primer/paint? Contamination somewhere in the process?
Such a HUGE effort to be thwarted at then...am wondering if anyone has suggestions about a way to fix from here...
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