Latest Discussions : Painting

BV022369

06:23PM | 05/10/20
I would like to use latex paint to on old plaster ( probably lime)walls in a 1800's (USA) house. Some of the walls had to be patched with new plaster where the old plaster was removed down to the lathe. There appears they have been coated with calcimine before being wallpapered. I searched the internet on which primer to use before latex and now I'm totally confused. Some of the sites , particularly from England, suggest the necessity of the walls to breathe. So,should I use oil, water based, shellac or Zinsser Guardz?

BV022377

02:19PM | 05/11/20
well I'm 35 yrs as plaster contractor. First keep in mind with Calcimine paint it is water based and can release due to moister or weight. Weight even paint weighs a little and the calcimine can release as it can not hold the weight. That being said any oil based primer will work. You want to creat a barrier from moister from the new paint to the underlining surface. Once that is done any corresponding paint to the primer will work.

Remember in England construction is totally different not a lot of wood frame mostly masonery and the lime is slightly different and can be thicker. Here your house was probably 3/8" wood lath with 3/8" to 1/2" plaster. The scratch or base coats are more than likely gypsum based with lime and gauging plaster finish. Very thin lime finish. Europe lime plaster can be +/- inch or more it does breath but not enough thickness here in america to make a difference... Good luck

BV022377

02:41PM | 05/11/20
One more thing I forgot. Before you apply the primer be sure the walls are clean. Water with TSP or any lite clearer will work. Just to get dirt and glue off. If you have some areas that have wall paper still on wall use Z prime and apply taping mud right on them. Again the underlining surface can release due to weight but we have had really good luck with that. Taping mud adheres by glue while plaster is a chemical reaction which takes longer creaets heat and pulls at underlining surfaces.

BV022369

05:19PM | 05/11/20
Thank for the info.You described the walls perfectly. I know what to get now.


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