yes
Yes, an oil paint will adhere to latex. It doesn't work in reverse, latex will not adhere to oil that is dry, but oil adheres to dry latex.
If you were a purist, though, you would sand down the woodwork before repainting it. That would give the best result.
As long as you use a good primer first, you can use it over anything.
Patches. Lots of them. There's a paint product called Kilz that should work well. I used it to paint over a cement wall stained with soot from a furnace, with good results. It's available at any of the popular home improvement stores. There are two types of Kilz stainblockers -- an alcohol-based product that is highly volatile and should not be used without an organic-vapour-cartridge respirator, and a water-based product that, while marginally less effective, is considerably less toxic. Either variety will accept a top coat well (ceilings are usually finished with a low-cost, non-washable flat latex paint. Ask your paint-store employee). prime it with "KILZ" primer and then finish coat with your selected latex paint color
You can paint over wall paper. However it is recommended that you prime with an oil based primer. Kilz Original for example. Most wall papers use water based glues for adhesion. If you put a waterbased topcoat over the the wallpaper it could penetrate the wall paper and cause the glue to release. You can use a waterbased top coat such as Kilz Casual Colors over the top of the oil based primer.
No, you use water to thin latex paint. Thinner is for oil based paint.
Try using Kilz, a great primer and sealer in one. Peel and sand off where it's chipping and fill the space in with Kilz. Make sure the walls and ceiling are clean. You might want to repaint with a paint especially for bathrooms. It won't be very expensive if you look for paint and supplies that are in your budget.
You can use interior Latex pearl paint on your bathroom wall. Pearl paint adds a special finish to the wall.
Yes or it can be the same as the wall paint if it should be flat.
You should carefully inspect the wall board for any damage. If the paper "skin" of the wall board has peeled off with the wall paper, you will have to patch that before you can paint. Otherwise, I would recommend a good quality latex primer.
As long as you use a good primer first, you can use it over anything.
Patches. Lots of them. There's a paint product called Kilz that should work well. I used it to paint over a cement wall stained with soot from a furnace, with good results. It's available at any of the popular home improvement stores. There are two types of Kilz stainblockers -- an alcohol-based product that is highly volatile and should not be used without an organic-vapour-cartridge respirator, and a water-based product that, while marginally less effective, is considerably less toxic. Either variety will accept a top coat well (ceilings are usually finished with a low-cost, non-washable flat latex paint. Ask your paint-store employee). prime it with "KILZ" primer and then finish coat with your selected latex paint color
Latex paint is best for walls
I would roller it with latex.
You can paint over wall paper. However it is recommended that you prime with an oil based primer. Kilz Original for example. Most wall papers use water based glues for adhesion. If you put a waterbased topcoat over the the wallpaper it could penetrate the wall paper and cause the glue to release. You can use a waterbased top coat such as Kilz Casual Colors over the top of the oil based primer.
No, you use water to thin latex paint. Thinner is for oil based paint.
Try using Kilz, a great primer and sealer in one. Peel and sand off where it's chipping and fill the space in with Kilz. Make sure the walls and ceiling are clean. You might want to repaint with a paint especially for bathrooms. It won't be very expensive if you look for paint and supplies that are in your budget.
Should we assume that you are trying to cover magic marker on a wall or something? First, I would try to remove as much as will easily come off with mineral spirits and a rag. Then you will want to apply a stain hiding primer such as Kilz. Then you can paint over the kilz (after it has dried of course).
Use a degreaser. Test a small area first to ensure that it won't damage the latex paint also.