If the pine was not completely dry(6-8% moisture content) before you put the finish on, water from inside the wood could try to evaporate out and cause the bubbles. When finishing outdoors, the top surface of the wood is considerably hotter than the bottom surface and inter and intra cellular moisture will try to escape through the hotter top surface causing bubbles in the finish. Been there, done that.
sawdustus
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A day without sawdust is a day without sunshine.
George
delta 650, hawk G426
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