We just removed wallpaper and the paste under it. Patched the dings,
cracks and gouges and on one wall applied some venier plaster. And some
of the walls were textured (swirls made with a brush). So, we had a
variety of surfaces to cope with. GF convinced me to apply a primer,
Zinser 1-2-3 with mold/mildew killer in it. Then we painted the large
room and it came out very nice. It concealed the various surfaces.
Applying the primer is another step and it takes time but I have to
admit she was right.
I like to use an oil-based primer, that's me. The paint companies and
their experts will say something different however. They will tell you
that is not necessary to buy another product since the intended fiish
coat will act as an excellent primer.
The only reason they even stock primers and oils is because old dudes
like me keep asking for it. I have to think you can have good results
either way. You may be able to produce a marginally better, more
durable, finish with a dedicated primer but it usually OK to skip it.
A few months ago I was prepping a wall to be primed/painted in our new
house. There was no primer between the drywall and the paint, and i
could find a small hole, and literally lift the latex paint off and
away from the wall in very large rubbery sections. The bond between
the two was just awful. I would absolutely prime the walls.
Standard industry practice is to use a primer/sealer followed by one
or two top coats as required. My personal preference these days with a
full wall coat of compound is to give it a coat of Gardz, followed by
a coat of primer, followed by one or two top coats as required.
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