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Oil on camvas drying from backside

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​Hello,

We know that oil paintings dry from top layers down to the core ground. Let’s just say that ground is oil as well. And I find this logical if that same oil ground is sealed beneath as it should be.  Now, size seals it. But, can size allow air to pass throug it? If yes, wouldn’t then sized canvas pass air throught from the backside and allow oil ground to dry from back as well? 

Primarily I am using animal glue as size.

Damir Pusic.

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