What Primer?

Humble Abode

50+ year old interior lathe and plaster.

Does it need a masonry primer? We will be doing some pretty extensive patching as well.

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Just because some of us can read and write and do a little math, that doesn't mean we deserve to conquer the Universe. Kurt Vonnegut, (1922 - 2007) from the Novel 'Hocus Pocus'
The NAPP
Milwaukee Painting Contractor

ProWallGuy

Gardz.

Oh, you want pigmented?

50% Bullseye 123
50% Gardz

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Wallpaper Hanger St. Louis
Digital Murals Installation

AAPaint

50 year old unpainted plaster? The best primer for plaster is a tinted shellac. The best of those available is BIN.

Very interesting combination PWG.....Gardz would make a great sealer for plaster, never thought of that.....and I can see tinting it with the 123 since it's water based as well, but we all know water is plaster's no 1 enemy.

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-AAPaint

AA Quality Painting & Pressure Washing LLC
Jacksonville Painters
Jacksonville, FL.

PlainPainter

A plaster surface deserves a qood quality interior oil primer, i.e. alkyd enamel undercoater. I have had good success with some of ACE's products. They have an alkyd enamel undercoater for like $20/can - yet they have a quick dry line called 'Stain Halt' - both in alkyd and acrylic formulations. And the Alkyd version seems to be every bit as good as their alkyd enamel undercoater for half the price! Acrylics are good for interior blueboard/veneer plaster jobs that are less than 60 days old.

-Plainpainter

Humble Abode

It's at least a 100 year old house, and it has been previously painted.

__________________
Just because some of us can read and write and do a little math, that doesn't mean we deserve to conquer the Universe. Kurt Vonnegut, (1922 - 2007) from the Novel 'Hocus Pocus'
The NAPP
Milwaukee Painting Contractor

PlainPainter

My rule is to use an alkyd enamel undercoater for old houses like that. You have no idea how many horrible homeowner paint jobs have gone on. With a latex primer - you have no ability to control any lifting of the old paint, it will allow the next layer of latex paint you put on to do strange things. I.E. say for instance you have calcimine or casein 'milk' paint - the latex paints will will react to them even with a latex primer. you put up an oil primer - and that's it - you can put on your favorite latex paint without worrying, it's a shield that keeps the more modern water based paints from reacting with the older layers.

-Plainpainter