Skinning in paint
What we now know is that it is not the temperature per se that causes the skinning effect, it is the change in temperature that causes the problems. Even a change in temperature of 10°C can be enough to cause skinning. The more rapid the temperature change, the more likely skinning will occur.
This research work culminated in a modified pail lid to reduce skinning in Resene pails. This modified lid retains a thicker layer of paint on the lid to reduce skinning. The lid is textured, which increases the surface area of the lid, thus increasing the amount of paint which remains on the lid. The more paint held on the lid, the less likely it is to skin.
Preventing the conditions that cause skinning is still the best way to solve skinning. A large proportion of the skinning issues are caused after the paint leaves Resene and is due to the way the customer stores the paint. Paint is best stored at a constant temperature of around 15-20°C out of direct sunlight. Differences in storage and handling methods is why some contractors in the same regions have more skinning problems than others. If they store large volumes of paint in their van in the heat of the sun and then the temperature drops rapidly overnight, skinning of the paint is likely.
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