Your sources are correct that it is ideal to allow acrylic paintings to dry in temperatures of 50F (10C) or above for at least 8 days, to ensure that the acrylic paint has dried all the way through.
To summarize, oil paints and OPEN Acrylics are most suitable to paint in cold or even sub-freezing temperatures. When doing so, for instance when painting en plein air in winter time, it would be best to let the paintings cure at room temperatures, as soon as they are completed.
The rule of thumb is that if you are painting with an oil-based paint, the ambient temperature should be above 45°F for at least 48 hours. Latex and acrylic paints typically require higher temperatures above 50°F. Some paints, however, are formulated to dry at lower temperatures, even as low as 35°F.
If you want to ensure that your acrylic paint remains dry, they recommend letting them dry in temperature for at least 8 days, without raising the temperature above 60F (10C).
Tips for Drying Acrylic Paint
Acrylic paintings also dry faster when set beneath a heat lamp, but don't set the lamp too close to the paint or it could bubble or crack. A hair dryer set on low heat can also speed up drying times; avoid getting the paint too hot to prevent cracking.
You can bake fully dried acrylic paint in the oven safely. You will achieve so called Baked finish, which is the effect of baking acrylic paint at temperatures higher than 150 degrees Fahrenheit.
In reality, painting can be done in a perfect climate, and it isn't these days when the temperature is above 30 degrees. Painting can be done best when the temperature is between 15 and 20 degrees, the humidity is between 70 and 80 percent, and there is a light breeze blowing.
How long acrylic paint will dry fully depends on the temperature, humidity, paint type, thickness of layers, and some other factors. In general, a thin acrylic paint layer will dry in 10-30 minutes, while a thick acrylic paint layer can take up to 2 hours to dry to touch. It takes about 24 hrs to be fully cured.
Acrylic paints are always smooth because it is water-based but the freezing may cause them to become lumpy, close to cheese-like consistency which then makes it difficult to handle and may give off a different color saturation than expected.
2 This indicates that the paint has lost its ability to emulsify and is incapable of curing properly. Due to its water content, water-based paint freezes at 32 degrees, while oil-based paint is much more resistant to freezing.
Paint needs an environment of at least 50 degrees in order to dry properly. It may crack sooner than later if applied in too-cold temperatures. Even if it is 60 degrees during the day, if the temperature dips below 50 degrees at night, the paint structure can be compromised.
Every degree of variance from that constant will influence curing times. The colder you stray from that steady and reliable point, the slower the reaction will be; on the other hand, the warmer your products are the quicker they will cure.
Most paint brands have labels that warn users not to paint in temperatures below 35 degrees Fahrenheit. Thanks to modern advancements in paint materials, most paint manufacturers now offer acrylic latex paints that can be applied to the exterior of your home in temperatures as low as the threshold of 35 degrees.
* You can use a hair dryer to speed dry the paint. * Acrylics can be painted on just about anything including canvas, paper, wood, ceramic, fabric, Masonite, plexiglass, fiberglass and glass. * Acrylics can be used as a glue.
An overall general rule of thumb is that oil-based paint can be applied when the temperatures are between 40°- 90° F and latex paint is best applied between 50°- 85° F. However, latex paints are best for most exteriors (we recommend 100% acrylic).
Allowing each paint layer to dry before adding another also will enable you to paint multiple colors on top of another. Thin coats of acrylic paint take around 10 to 20 minutes to dry. Thicker coats of acrylic paint dry between coats in about an hour or two.
Paint should never be applied at under 50 degrees and ideally not under 60. Take into account the temp of the walls, which in winter can be colder than the room air temp. Keeping rooms temperate will allow paint to dry faster and deliver the best results.
If you absolutely must paint in cold weather, there are some paints on the market that can be used in temperatures as low as 35 degrees Fahrenheit (1.7 degrees Celsius). You can also use a heat gun to systematically dry the paint. Paint a small area, then dry it with the heat gun and move on to the next area.
The ideal range is between 50 to 90 degrees. If it's too hot, the paint is forced to dry quickly, which can lead to cracking or can cause a film to form on the painted surface. If it is too cold, on the other hand, the paint will struggle to bond to the surface, and often remain a gunky mess.
The main reason that acrylic paint tends not to dry is due to the water and moisture content in the paint being too high. Acrylic paint dries by evaporating the water in the paint formula to leave the pigment behind so the quicker you can do this, the faster your paint will dry.
You can bake acrylic paint on ceramic mugs and plates in a conventional oven. Acrylic is non-toxic. However, the paint may wear off with constant washing, and you should take a few precautions. It's only considered food-safe if you fire ceramic dishware in a kiln.
If you need to quick-dry paint on furniture or walls, use a hair dryer to speed up the process. Focus the hair dryer on the area that is drying too slowly. Keep the nozzle of the dryer about 2 inches away from the surface so that the paint doesn't blister.