Yes you can plaster over old plaster. There are some primers that will assist adhesion, but I've never had a problem leaving them out and just applying slightly wetter plaster.
Yes you can. You must first paint over the old plaster with a product such as Eucoweld, which chemically adheres the new plaster to the old.
lath and mortar walls and ceilings have a greater flexibility than standard plaster. If you do plaster over it you firstly need to be very confident that the old mortar is sound and fully adhered to the lath. You would also have to seal the ceiling well to stop the water in the plaster from literally being sucked out of the plaster. Regarding tiles. If you are thing about ceramic tile then NO!. The weight of the tiles would pull the mortar from the lath with great ease. It is defiantly better to either plasterboard directly to the old ceiling and using dry wall screws NOT NAILS screw directly to the joist not the late you can then put a good scrim tale over the joints and plaster accordingly. The very best option however, is ...............drop the old ceiling, re-board and plaster
The finish plaster is normally white all the way through. It sounds like you are dealing with a pool that has been replastered by the method of putting a "brown coat"/"scratch coat" (the gray plaster you noted) over the original finish plaster surface, and a new finish coat of white plaster on top of that. The scratch coat more like a thin concrete than plaster (doesn't have the white marble dust in it) and is used to get a better bond to the old surface.
Paster of paris is a form of drywall, so I'm unclear on your meaning except possibly you have a wall with plaster over lath and want to cover it with drywall. You can find the studs electronically and go ahead and attach drywall to the face of the plaster with extra long screws. - Personally, I would rather repair whatever is wrong with the plaster and lath.
Kal-Kote Finish Plaster is a white finish plaster that can be troweled on and left with a smooth or textured finish, over base coat and on top of blue board. We also use this plaster when we are resurfacing existing walls and ceilings that have been prepared using plaster washers and fiberglass mesh tapes over the cracks, and gluing the entire surface with "Plaster Weld " ( a Larson product ) to create a bond over previously painted walls and ceilings . We also tint the plaster to make any color desired , and apply two coats of machined buffed wax to give the walls a satin smooth finish burnished with steel wool .You will never have to paint again !
A fresco was painted on plaster. A good example is the Sistine Chapel. Michelangelo would apply the plaster to the ceiling and while it was still wet place the pattern he had drawn on the plaster and trace it into the plaster. Then, he would apply the paints. Many times he would decide he didn't like what he had and break it out starting over with the picture.
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