Factors that can affect the drying time of Acrylic Paints:
Humidity in the air dramatically affects how long it would take to dry Acrylic paint. The higher amount of humidity usually extends the drying period, & lowering the humidity makes the paints dry faster.
In arid climates Acrylic paints dry faster, so painting outside is very difficult & challenging as well. Then you will be needed to add retarders in paint & wet platters the prevention of quick drying of the paints.
Working Inside is more eraser for having control over Humidity in the air. Also, the heating system & air conditioning system helps to reduce humidity. However, some of the heating systems increase the amount of moisture in the air as well.
So need to make sure the heating system is as you need it. The different areas of your working station may have different humidity levels.
You can use a Dehumidifier to lower the Humidity level, & if you have the opposite problem of too much dry air, you can also use A Humidifier for your workplace or studio.
The high temperature will evaporate the water from the paint faster, & that will make acrylic paint dry faster than a normal time period. So working or painting outside could be more challenging in hot weather.
On a very hot day, you could use a wet palette for preventing fast drying out of the paints on the palette. On the other hand, Lowering the temperature will extend the time period of drying the Acrylics.
Using of Acrylic gel:
Using an Acrylic medium like Gel, Retarders, Professional acrylic paints, & other products may slow down the drying time of Acrylic paints. So when you will use this kind of Gel or any other product which makes acrylic paint dry slowly, you should leave the paint for at least overnight or 24 hours to dry properly.
Uses of Water:
Using pure Acrylic paints without adding water in it takes much longer to dry than you mix some water in the paint, just because pure Acrylics have a thicker consistency which will take a longer time period to dry.
Because water could normally evaporate. On the other hand, on a porous surface, adding too much water will extend the time off additional 2 hours or more to dry.
Thin Or Thick Layers of Paint:
Since the Acrylics have a thicker consistency, the drying time depends on the thickness of the layers of the paintings. How thick you will apply the layers, can affect how fast it dries.
Using thin layers of Acrylics may take a minute or 2 minutes to dry, so it can ensure a shorter waiting time to dry the paint. However, using thicker layers of paint will extend the drying time from 2 hours or above.
Environmental Issues :
For Fast-drying Acrylic paints, you need to make sure a warm, Low humidity room or work station, with
enough ventilation, so that the air flows can make the Acrylic exposed. Otherwise, a Cold & Humid room with no airflow will make the paint dry slower.
Basically, Acrylic paint is much more popular than any other media for creating art. But on the other hand, its fast-drying characteristics are really difficult to work with. Though there are a vast of solutions
available for speeding up or making slower the drying process.