Reversable treatment for laminate benchtops?

I had a condo remodeled in Maui, Hawaii. The walls were cement mostly with heavy texture and high gloss paint. I had the walls resurfaced, lightly textured, and painted with flat paint. The walls still seem soft in spots, I can press my fingernail in, and the paint chips off VERY easily. It has been a year. The contractor said it is because i should have used a semi-gloss paint..... What was done wrong and how can I fix it?

I've read that you can make some with the following details: "To create your own chemical stripper, mix 5 parts denatured alcohol, 3 parts mineral spirits and 1 part acetone. This combination of solvents will loosen the paint from the plaster without causing serious damage. Apply and scrape away until all paint is gone." [B]Does anyone know how long does does this homemade solution take to work before the paint becomes softened and ready to peel away ?[/B] A couple of hours or less maybe ? [url=http://homeguides.sfgate.com/easiest-way-remove-old-paint-plaster-walls-98841.html]What Is the Easiest Way to Remove Old Paint From Plaster Walls? | Home Guides | SF Gate[/url]