Bill:
Hope it works out. If it doesn't, keep in mind that you can always paint over that acrylic clear coat with an oil based spray paint, thereby establishing a truly impermeable film over everything.
Chaniarts:
You said:
Quote:
Originally Posted by chaniarts[_3_]
there are different kilz products. the one kilz is recommended for
contains shellac, and is used to hide water stains and such, because it
will stick to most anything, and most anything painted over it will
stick to that kilz product.
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I think you're mixing up two different primer/stain killers made by two different companies.
KILZ or, as it's called nowadays, "KILZ Original" is made by MasterChem Industries, and it contains lotsa naptha, but no shellac at all.
BIN, is made by Zinssers and is a shellac based primer/stain killer. Zinssers calls it a "white pigmented shellac" which is just their way of saying "it's a shellac, but it's white in colour cuz we put lots of white pigments into it".
When a stain "bleeds through" a paint or primer, what's actually happening is that something in the stain is dissolving in the mineral spirits or water the primer or paint is thinned with, and then diffusing through the wet primer or paint film to discolour the surface of the film. When that film dries, the surface will remain discoloured, and that discolouration is called "bleed through".
So, the whole trick to preventing bleed through is to use a primer or paint who's thinner won't dissolve the stain. In 99% of cases, if the stain dissolves in the water of a latex primer, it won't dissolve in the mineral spirits thinner of an alkyd primer or paint, and if it dissolves in mineral spirits, it won't dissolve in the water of a latex primer or paint.
The reason why shellac makes a good stain killer is because:
a) you're correct that it'll stick to just about anything short of a raw egg yolk.
b) not nearly as many common household wall or ceiling stains are as soluble in alcohol as are soluble in mineral spirits or water, and
c) since dry shellac is only dissolved by alcohol, you can paint over the dried shellac stain killer with EITHER oil based or latex paint without fear that the paint thinner will dissolve the shellac and allow the stain to bleed through again. That is, you're confident that the shellac will "encapsulate" the stain.
So, while they're both good products, BIN is the one with the shellac in it.