You MUST check if the previous paint was an oil based paint. I've heard that if it is Latex (water-based paint) when you rub the wall with a cotton ball dipped in alcohol the color comes off. If not, you know it's oil and you MUST use an oil-based primer that will allow you to convert to a latex paint (Latex paint will stick to an oil primer but not to oil paint.) This is important because otherwise your paint will blister and peel right off the walls!
|The paint started peeling off so I decided to write a message to my father who was helping us install crown molding. I literally just scratched it off with my nails.|
|We had to scrape all the paint off the walls. You can see that we had not yet scraped the paint on top of the doors but had completed the wall on the right side of the picture.|
My suggestions for a great primer:
Cover-Stain by RustOleum, it smells strong but it dries very fast. It's thick and provides great stain coverage and paint adhesion. I've tried the odorless version but it's not a good as Cover-Stain.
Behr paint and primer in one is FANTASTIC. If the previous paint was latex I strongly recommend this paint. It gives great coverage, dries fast and looks soooo great!!! It WILL cut your paint time in half- at least!
If you are wondering about the difference between oil and latex paint see the following link for more information: http://www.thisoldhouse.com/toh/article/0,,219538,00.html