I am using Hempel Polygloss, a reputable manufacturer 2-part Polyurethane paint. At the bottom there is a manufacturer recommended 2-part epoxy primer that is sanded smooth. The first layer goes on well on both of my attempts, but on both cases the second layer does not stick to the first.
Frustrating to say the least. Not to mention fairly costly and very laboursome.
Any ideas why this is happening? Especially on the second try I was careful to follow the instructions extra carefully. The inside temp was/is around 16 C (within the required minimum of 10 C by a large margin) I painted the second coat 24 hours after the first. Same paint but different manufacturing lot number.
I contacted the manufacturer, and they confirmed they have no reports of either batch being bad and did not have a definite answer as to what happened. Their only thought was that the 24 h was maybe not enough to evaporate all the thinner if the air circulation was not adequate. Hard for me to judge but my only hope right now.
Any advice anyone might have before I try the third time to sand everything, mark, paint etc? Even encouraging words might help to keep me from getting depressed

Pasi
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