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TheApocaLuke t1_jdoixfq wrote

Reply to comment by imoutohere in Old paint bubbling when redecorating by jacobo164

Paint prep soap. Used to come as a powder that looks like sugar.

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imoutohere t1_jdojbz4 wrote

Interesting, I would say that you didn’t get the residual soap off the wall and it caused that reaction. Scrape off the bubbles, spot patch. Spot prime and you should be good

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jacobo164 OP t1_jdp171g wrote

Sugar soap seems to be the UK equivalent of TSP in the USA, however they're formulated slightly differently.

Thanks for the advice, I started scraping off the bubbles to patch (while the wall was slightly wet still from cleaning) and found the top layers of paint came off very easily even where there weren't bubbles. It looks like the best option is to scrape all the paint off back to a layer that is adhered properly.

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