U of S | Mailing List Archive | alt-photo-process-l | Re: Wood panel preparation (Keith?)

Re: Wood panel preparation (Keith?)

Thanks Keith! As I understand it, I need to increase the whiting amnt. in
my preliminary formula, since I choose to mix equal *weight* of acrylic
gesso with whiting (50g gesso + 50g CaCO3), but you say equal *volumes*...
That was good to know. Thanks for the info about sizing.

Few more questions:
- What is your sizing solution strenght?
- What is your coating method? (Detailed description please; how much
layers? exact application method and procedure? - crossing fingers: I want
to be able to coat with a foam roller...)
- Do you sand the acrylic gesso before sizing? If yes, how? What is your
exact procedure?

I feel like leaving the "traditional gesso" plan behind, it's too much
complicated for my liking -> I may resort to it if everhing else fails,
but I'm afraid it has its own problems as it looks like a method that
should be mastered - painfully!

Thanks again & regards,

24 Şubat 2009, Salı, 4:22 pm tarihinde, Keith Gerling yazmış:
> Hi Loris!
> The #1 formula you present is very similar to the one I use with great
> success:  1:1 Liquitex acrylic gesso to water and then to that 1:1
> dilute gesso to pumice by volume.  That produces a surface that acts
> very similar to paper, so I size it with gelatin and hardener.  This
> mix is very good for coating porous surfaces such as wood, plaster
> (spackle-ed wood) and old gumprints on paper.  For surfaces such as
> aluminum and glass, bubbles of water tend to form between the surface
> and the gesso with long soaks.  For these surfaces I do not use
> acylic, preferring to mix up a concoction of gelatin, pumice and
> marble powder.  I haven't used this in a while and I haven't reduced
> it to a recipe, but essentially it is a gelatin mix (the same as used
> for sizing paper) with 50% pumice and marble.  It produces a surface
> that is so hard that it is actually very hard to remove even with a
> belt sander!
> Hope this helps
> On Tue, Feb 24, 2009 at 2:30 AM, Loris Medici <mail@loris.medici.name>
> wrote:
>> I will try to print gum on wood panels (marine grade plywood). I will
>> try
>> two different grounds: 1) Acrylic ground + whiting (I presume that's
>> what
>> you do Keith?) 2) Traditional gesso ground...
>> 1) Keith, what is your acrylic formula? I plan to dilute acrylic gesso
>> 1:1
>> with water and then add equal amnt. of calcium carbonate (marble dust)
>> and
>> some white pigment into it. For instance: 50g acrylic gesso + 50ml water
>> +
>> 50g calcium carbonate + 10g titanium dioxide (titanium white -> purest /
>> brightest white pigment).
>> 2) Traditional gesso: 100ml water + 10g hide (or rabbitskin) glue (high
>> bloom gelatin) + 60g calcium carbonate + 12g titanium white.
>> I need a good working recipe and application (and finishing) procedure
>> for
>> #2. BTW, traditional gesso is a PIA! (Have to keep it hot + it doesn't
>> set
>> quickly, so takes awfully long to complete 4 - 6 layers...)
>> Another questions:
>> 1. Do you harden the traditional gesso ground?
>> 2. Do you add a hardened gelatin layer on top of the acrylic (or
>> traditional gesso) ground?
>> Thanks in advance,
>> Loris.