Bubbling finish


thefischbowl

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In June I finished building an endtable.  To finish it I used 4 coats of Shellac.  After sanding it smooth I applied 3 coats of General Finishes Arm-R-Seal.  

Now I have noticed that the finish appears to be bubbling up in places.  It looks like the table has a rash.  Are there any theories as to what is happening?

The table has been kept in at about 77 degrees until last thursday when the AC broke.  Since then it has been bathed in the humidity of Virginia.

Any advice would be helpful.

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That's a lot of shellac! Did it have wax in it? If so there is the problem as poly won't stick to waxy shellac. 

I used Zinnser Bullseye clear coat.  I thought Zinnser was dewaxed, but I don't see anything about is on the can.

I did put the shellac on all sides, but only put the arm-r-seal oil-urethane on the visible sides.

 

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