What steps should I take to paint plaster walls that are in good shape?

I just purchased a house built in 1930. It has plaster walls that are in good shape. I want to repaint them. Do I need to prime first? If so, can you recommend a primer. I'm not sure if the existing paint is oil based or latex. I will also be doing the woodwork which is not in as good shape. The paint is chipping. Do I have to scrape it all off or can I prime to seal the chipping?What steps should I take to paint plaster walls that are in good shape?
Scrape and sand the spots that are chipping, otherwise the new coat will just keep chipping.





A rule of thumb is that you can cover oil paint with latex, but not the reverse. It would be best for you to use a primer first.





To save some money, you can have you primer tinted to the same color (or similar color) you are going to be painting with. If you do this you might be able to get away with not having to use multiple coats of paint to get it to cover.What steps should I take to paint plaster walls that are in good shape?
check with your paint store and you can purchase a primer sealer with and adhesive additive.


prime with water or oil, then paint using the same base as you did the primer.


chip off the large stuff and the adhesive will take care of the rest.
If the walls are in good shape, then paint right over them. If repair is needed, prime first, then paint. Get a good interior latex primer (doesn't really matter what brand, all are about the same).





The trim will have to be scrapped, sanded, primed then painted. Use caution as the paint most likely has lead in it. You can purchase a home kit to see if it is lead, but a professional should be consulted. Follow his/her recommendations for removal, etc. Good luck.
I would remove the paint from the wood first with paint remover that give it a primer, and paint. The plaster can be painted with a primer than paint. I use ';Kilz'; on everything as a primer.