How to Fix Peeling Masonry Paint
The first thing you need to do is remove as much of the existing paint as possible. You can either use a scraper and some elbow grease, or you can go with a pressure washer. Just be careful not to damage anything else and be safety conscious when working at heights. If you’re using power washing, let your plaster dry for a few days before moving on to the next step.
Next, you need to stabilize the surface and glue the edges of the existing paint so that they don’t stand out again. For this I use a product called Zinsser Peel Stop. There are other stabilization solutions on the market, but Peel Stop is perfect for what you need here. It’s a water-based product and, as the name suggests, it prevents the paint from peeling. Just make sure you adhere to the 2 hour drying time (longer if you can). If you rush things, you will cause even more problems.
I usually do my filling at this stage. The peel stop will help mask the edges of the remaining paint, but you can also fill in round if you feel like they’ll show up after you’ve painted. Otherwise it’s just deeper holes. My favorite masonry filler is Toupret Murex because it dries rock-hard and lasts for years.
The finished color
It is important that you use a breathable paint product to finish off. By using something that lets your plaster or masonry breathe, you avoid mistakes that could otherwise be caused by moisture or limescale. For me this product is Weathertex AP77 smooth masonry paint.
Weathertex is a water-based product with silicone technology. Not only does it allow a surface to breathe, it is also water-repellent and self-cleaning. Weathertex also sticks hard and fast and then dries for exceptionally durable. Click here to learn more about Weathertex.