07:24PM | 04/20/14
I spent days prepping my back entrance interior walls. The old latex over drywall is 15 years old. I first washed down the walls with TSP and rinsed them. Then I spent days sanding the old paint down. I used a mouse sander and sanded every surface extensively with 50 grit and then repeated with 80 grit. I spent a ridiculous amount of time sanding because the old paint job had so many thick brush marks and drips (and I'm obsessive). I also repaired dings etc. Then I vacuumed the walls and finally used a damp mop to ensure all the dust was removed. I waited 24 hours after damp wiping before I started to paint. I am using a Sherwin Williams primer and as it is quick drying I added some Floetrol as it was advised to help minimize brush marks from cutting in etc. (I am slow and wanted to hedge my bets). I noticed a couple of bubbles appear a few minutes after I painted one area. Then an hour after I finished painting three small walls I went back and discovered several areas of the walls have a lot of bubbles. What is causing this and what do I do? Nothing online seems to apply - my house isn't humid, the walls were dry, there was no dust, I've used primer?? In a couple of places I have sanded down to what may be older brown oil paint, but after sanding shouldn't primer stick to this? Plus many bubbles are appearing on places where the sanding was only roughing up the yellow latex or the white primer under it and didn't reach any layer that could be oil paint. Why isn't the primer adhering? Please help! I have an entire house to paint and my disability income will not allow me to hire a painter.
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