If either of these conditions apply, it may be necessary to control the climate in which the painting is being created. Yet the look of a sealed layer may not be acceptable for ones style or it simply does not supply enough open time to complete a concept. Often times, simply sealing sub-layers of a painting will provide greater blending time. As you can see, having a sealed surface offers an impressive 15 to 20 minutes of active working time at 70F 50% Relative Humidity! In this case we used GAC 100, but any gloss gel or medium will work similarly. Finally, we coated the Gesso with an additional layer of gloss acrylic. Even though Gesso is designed to be absorbent, it is dramatically more sealed than the paper and offers just less than 5 minutes of working time and is very locked down after 10 minutes. Next, we created a second zone by simply coating the paper with a layer of GOLDEN White Gesso. The first zone of uncoated hot pressed watercolor paper wicks away moisture so fast that the artist realistically has 1 minute of working time and everything is pretty locked down after 3 minutes. This image of Titan Buff next to Transparent Red Iron Oxide (right)is drawn out at a thickness of 3 mil (.003.) and shows very clearly how the substrate affects dry time. This causes paint, especially if in thin layers, to cure much faster as volatile components escape into the substrate as well as the atmosphere. Substrates and absorbent layers (even previously painted layers with more porous pigment such as earth colors) tend to wick water away from the paint much faster than glossy/sealed layers.
One area of initial control available to the artist is the layer immediately below where they will be painting.
#Timecontrol ge sso how to#
This article hopes to explain both: how to control the drying rate of acrylics by discussing additives, studio conditions, and substrate as well as describing the mechanisms of initial drying and how prolonged paint cure times may affect the properties of a dry paint film. Some artists even love to use fans or hairdryers to speed it along however, there are many times when an effect is desired for which, frankly, acrylics dry too fast. Acrylics are mostly known for their ability to dry quickly, allowing artists to layer and over paint in rapid succession.
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