Putting right faulty painting

The best way to correct this issue would be to remove the bubbled and cracked paint completely, down to the bare wall. Then, you need to ensure the wall is completely clean and dry. You can then apply a sealer or stabilizing primer specifically designed for porous or unstable surfaces, to prevent the paste from affecting the new paint or plaster. After that, you can either apply a new layer of paint or skim the walls with a thin coat of plaster, depending on the level of finish you desire. It's important to make sure that you allow adequate time for the sealer or primer to dry before proceeding with the new paint or plaster, to avoid any further issues.

yes so I would also agree to strip to bare wall again and seal it however it needs to dry as naturally as possible, you do not want it to dry to quickly this is very important!.

I would clear the bubbles, fill sand and then prime. After drying, one coat of Matt paint / miscoating / and then painting.

This happens when the plaster is still wet from stripping the paper from the wall. Scrape off the parts that have bubbled, sand the areas to remove any paste residue and to create a smooth finish. With a dry cloth remove the dust from the wall and repaint on a completely dry wall. Ash River Point Home Improvements Ltd

Whenever painting over a wall that's had wallpaper, always thoroughly clean the wall prior to paint with sugar soap. Paste will reactivate when wet forming a goo. Same goes for over skimming. Preparation is key.

If the problem is due to the reactivation of old paste by water-based emulsion, then the best way to correct it would be to remove the bubbling and cracking paint, and then seal the walls with a suitable sealer before painting again. One option could be to use a stabilizing solution such as Zinsser Gardz, which is designed to penetrate and seal damaged surfaces. This will prevent any remaining paste or adhesive from reactivating and causing further damage to the paint. Alternatively, if the walls are in particularly bad condition, you may need to skim the walls to create a smooth surface before painting. In this case, it's important to make sure that any remaining paste or adhesive is removed completely before skimming, and that the walls are allowed to dry thoroughly before applying any new products. Using lining paper is another option, but it's important to make sure that the paper is properly primed and sealed before painting. This will prevent any moisture from getting through to the paste and causing the same problem again. Overall, the key is to make sure that the walls are completely clean and dry before applying any new products, and to use a suitable sealer or stabilizing solution to prevent any reactivation of old paste or adhesive.

With correct equipment this is a very easy fix, by hand it will take longer but is achievable - sand walls with a dustless sander to remove any failed paint, undulations, imperfections and clean free of dust with a hoover and wooster dust eater three passes per wall hoovering the wooster dust eater after each pass -clean the walls using zinsser Dif in sections along the wall then rinse until the wall runs clear, usually 3 buckets. -let the wall dry and then apply a coat of zinsser gardz this will prevent any paste trapped behind the existing layer of paint from reacting with the fresh emulsion. -finally two coats of emulsion best of luck