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cold will only slow down the process.. my shop stays around 60 year 'round... air is the culprit ( as others have stated) another reason i went to the dip tubes... there is very little surface area in comparison to the volume of fluid.. mine have been in the tubes since october and have never skinned ( a mixture of Urethain/tung oil and oderless mineral spirits).. after each session the tubes are capped off...and that mixture is from last season..when Im done building for the season... I strain out the mixture through a paint filter to take out any forgien matter and fill gallon paint cans full... cover with plastic wrap and install the lid...and put them on a shelf until next fall...
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