That is odd-acrylic should stick to most anything. How many coats have you applied? It may take several to completely cover it.
I had a similar problem once but not with clay. I basecoated it with housepaint. I found the formula to be a little thicker and it still is acrylic and paintable over by craft acrylics. Also it didn't lose any of the detail.
I know this may sound stupid go to art store pick up MODGE PODGE its a hard glue base and is cheap dillute with some water brush on let dry you can give second coat as well. this stuff will fix your problem its a sealer hope this helps Dave
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