Comment Guidelines
We welcome your feedback on Houseandhome.com. H&H reserves the right to remove any unsuitable personal remarks made about the bloggers, hosts, homeowners and/or guests we feature. Please keep your comments focused on decorating, design, cooking and other lifestyle topics. Adopt a tone you would be willing to use in person and do not make slanderous remarks or use denigrating language. If you see a comment that you believe violates any of the guidelines outlined above, please click “Alert a Moderator.” Thank you.
OK

It really depends, priming is essentially used to improve adhesion to the surface you are going to paint. If you are repainting and the new color is drastically different from the old one then its a good idea since you won't have to apply as many coats of the new paint to effectively change the color. And as Mrs. Peacock said it will help seal it first.
Since your new color is similar to your old one then I would say that a good sponge sanding and a wash with TSP would be just as effective as priming. I've done this many times on many projects and avoided the use of primer altogether. Sanding improves adhesion, dulls the old color, and removes unsightly marks and odors.
As a developer it makes more sense from my perspective to avoid priming if possible since I'm often painting very large areas. Whatever you choose I think it will look great either way.
If you check out one of my projects www.aryze.ca/the-uplands/ many of the walls were sanded, washed and repainted without the need for primer.
Yes prime should be applied to wall first as it will hide last paint which is earlier coated on your wall.
You ususally don't need to prime if you are painting to a darker color.
I'd suggest priming the ceiling before adding any texture
Other than that, most re-paints don't need primer unless other issues are present (decades old builder's paint, drastic color changes, latex over oil, etc...)
For more information visit http://www.everestind.com/products/ceiling.aspx
I think priming is always a good idea as well. One, it corrects the imperfections from previous paint jobs and gives you a clean surface. I like to use oil based, but I know that many people shy away from oil based.
I always suggest priming first. It doesn't take that long to do, and will make the new color that much more vibrant. Also, priming will help the new paint to last longer.
Thanks Mrs. Peacock.
I guess it's better to invest a little more than have paint chips fall into the popcorn bowl:)
I would say the answer is yes. First it will help cover the peach colour, second, if there is any cigarette smoke residue or dirt, etc. it will help seal it first.