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, Loris. 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.
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