'Robert Macy[_2_ Wrote:
> ;3026922']Anybody know where to buy lead based paint?
You won't have to ship it. You can buy it locally, or at least make it
from materials you purchase locally.
In the mid-1970's, lead based pigments (which for the most part was
primarily the white pigment "lead carbonate") were banned in
ARCHITECTURAL paints. But, lead carbonate was never banned in artist's
paints, and you can still buy lead carbonate pigment as a powder in any
artist's supply store. Just ask for "Flake White" or "Lead White"
pigment or paint, whatever they sell. Flake white and lead white are
the same thing being sold under two different names.
If they only sell the pigment as a powder, ask if you can order it as a
paint. It might come in a tube, but you can just thin it with the
recommended thinner and apply it with a brush.
If you buy it as a powder, you might have a bit of difficulty dispersing
it in a tint base. That's because the colourants in the paint tinting
machine at your local hardware store consist PRIMARILY of different
pigments suspended in glycerine, but there's also a dispersant chemical
in each colourant to keep the pigment particles dispersed. So, the more
colourant you add to your paint, the more dispersant you also add to
keep the pigments dispersed. Adding pigment powder alone to a paint
without any dispersant could cause problems with the pigments clumping
together and making the paint dry to a dull, or even lumpy finish.
The people working in artist supply stores often have university degrees
in fine arts like painting. They would know if they sell a dispersant
you can use, or if there's something else you can use as a dispersant.
Besides buying a lead white acrylic paint in a tube, another option
would be to mix the lead white powder into glycerine, and then mix that
slurry into boiled linseed oil. The glycerine will evaporate from the
wet film, and once the remaining linseed oil absorbs oxygen from the
atmosphere it'll harden up in a few days with the white lead carbonate
particles suspended in it very much like the raisins in raisin bread.
And, that's all any paint actually is; tiny coloured particles too small
to see individually suspended in a transparent or transluscent solid
film in sufficient quantity to make that film opaque. To make for a
harder and more durable paint, you might try mixing that glycerine based
slurry into polyurethane hardwood floor finish instead of boiled linseed
oil. I don't see why that wouldn't work, but I've never tried it.
Certainly, glycerine won't interfere with the proper film formation of
either boiled linseed oil or polyurethane hardwood floor finish, no
matter how much you add.
Hope this helps.
Besides lead carbonate, which was universally used as the high hiding
white pigment in architectural paints prior to the mid-1970's, lead
oxide was also used as a red pigment in metal primers. I don't know of
any other lead based pigments used in architectural paints or the kinds
of primers DIY'ers would commonly use.
Since the mid-1970's, the rutile form of titanium dioxide has replaced
lead carbonate as the high hiding white pigment in architectural paints.
DuPont is one of the largest suppliers of titanium dioxide to the paint
manufacturing industry with their "TiPure" line of titanium dioxide
pigments. DuPont used to have a truly excellent website which explained
the optical principles by which titanium dioxide provided good hide in
paint, but I haven't been able to find that site now for years. I
expect they took it off the net, but it might still be on the Ti-Pure
web site somewhere.
Believe it or not, there was a time I was seriously considering making
my own paint to solve a problem with fading I was having in my apartment
block. I was planning to buy the super fade resistant pigments like
lead carbonate, cadmium yellow, cobalt blue and such from art supply
stores and adding them to a latex satin tint base that I could buy at
any hardware store to make a super fade resistant paint. I never did
that because I found that what I was dealing with wasn't the paint
fading after all, but airborne sticking to the cold interior walls of
the building, causing the paint to gradually turn darker.
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