I was also after painting my house,...I was going to paint the exterior foundation wall surrounding my garage and small parts of the foundation that shows. It's a different color and seems to be in good shape except only 3 places where the paint has peeled back to the stone (cinder block) The rest is a nice semi-gloss finish but I want to add a different color and make it a also a semi-gloss. Do I have to degloss?....... if so how can I or can I just clean it and prime over it then paint with semi-gloss.
I believe its always a good idea to degloss or lightly sand any paint that has a sheen in order to ensure proper adhesion. There are deglossing agents on the market that are water thin, are easy to use, and relatively inexpensive. I would recommend this over sanding due to the size of your project. Masonry should be primed before it's painted, otherwise it is prone to peeling (which may be the reason you have peeling). Good luck!
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