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Join Date: Apr 2000
Location: The Wilds Of Canada
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The big problem here is you are mixing together two differently suspended mixtures. One has an over all semi-gloss charateristic, and the associated materials that create that within the mixture. The other has a different particle size and has a different suspension method and final purpose.
So, to a certain extent you can get away with mixing the two, but you have to be aware that you are mixing together not just two paints, but the two different surface textures as well.(meaning: how the paint supends, has a surface and final dried surface texture)
The way I would do it is to use the gesso as a base and mix in some titanium white which would even up the surface texture and the particle size as well. This would end up creating a slightly directional charateristic in multiple dimensions. The gesso is designed to dry very quickly, which is probably where some of your problems are coming from. You can buy a small bottle of retarder to alleviate some of this effect. The retarder has the double effect of being a suspension system that aids in the thourough mixing of the batch. Use about a 10% mix of retarder. Use a variable speed drill mounted mixer and mix well. (about 10-15 minutes at average to lower speeds) Latex paints are designed to go on in a single coat. A good screen would take time to construct, and it's accuracy must be of a much higher nature. A thinned mixture that is a little thinner than the average latex is about right. Multiple thin coats end up being the rule. How the paint settles is critical. Because of the nature of the acrylic paints, one coat per day is the application timing.
You have to understand that the design specs of a high grade gesso are so that the resultant finish is of such a chaotic nature that there is no matte white finish of any kind availible that exceed it in the correctness of it's diffusion and gain charateristic. It is closer to a true gain of 1.0 than anything else availible. Of course I will state that because of my limited knowledge of screens, I could be horribly wrong about that statement, but I seriously doubt it.
Back to mixing:
What you end up with is a highly diffuse mixture that has a gain charateristic due to the particle size mixture and texturalization of the surface finish.
(don't mind the little '?' icon, I'm just amusing myself with playing with the icon selections...)
[This message has been edited by KBK (edited June 11, 2000).]
"Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge.