Can I paint over a semi-gloss painted wall with a different semi-gloss paint?

Yes you can no sanding is required you have no reason to sand semi gloss over the same product sanding is only for bonding one coat to another or smoothing out surfaces.*





Since your going a darker color try to get a deep-base paint store will know what you or talking about sometimes depending on the color they cannot mix some dark colors withnothing but clear base which will case you to have to put more coat ( example red ) 6 to 10 coats so ask for a deep base if they say no look into another darker color to save all that work dark colors on the last coat make sure you just do one wall at a time cut in and roll are it will lap and hat band.*Can I paint over a semi-gloss painted wall with a different semi-gloss paint?
Absolutely, you sure can.Can I paint over a semi-gloss painted wall with a different semi-gloss paint?
yes lightly sand for a good gloss
yes but the color may need two coats a light gray or a dark gray primer may be called for dark gray makes deep colors solid and light gray makes light like yellow solid but if the two colors are close just clean the walls by washing quick with a roller mop and some streak free spicand span also add a tablespoon of vanilla extract to the paint that kills the oder a little or in a musty room like a bath or basement add a ounce of bleach and mix well good luck ...a painter 26yrs
Do you mean can you paint over an oil semi gloss with a latex sem gloss or vice versa?


You can use an oil to go over a well cleaned (with T.S.P.) latex but you would have alot of extra work to do if you want to use a latex over oil? Can you give more info?
Yes. Sand lightly first with 150 grit open coat paper.
yes. make sure you do enough coats so you don't see the old color through, though.
yes, you can. If you choose to apply primer first have the paint store add a little bit of color (the new color you want to paint the walls) to your primer.