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Problems with layers of varnish, paint and primers.
There are several causes for loosening of varnish, paint and primer from the underlying layers or from the stretcher, for example by mutation of moisture through the canvas and the layers of primer and paint. Another example might be shrinkage of the panel, causing the old layer of paint and primer, having lost its flexibility, to be squeezed together and come loose from the panel.
 
cracking, craquelure - cracks in the ground and paint layer.
 
curling or open cupping - sections of the paint layer are
deforming and the edges are coming loose
 
curling or cupping - sections of the paint layer are deforming,
the canvas goes with deformation of the paintlayer
 
blisters, disintegration caused by heat
 
flaking - the loss of big sections of the paint layer
 
flaking - the loss of sections of the paintlayer
 
tenting – lifting up of paint from a support into a tent shape
 
tenting – lifting up of paint from a support into a tent shape
 
disintegration of the varnish - loss of sections of the
varnish layer
 
dent caused by pressure from the backside with flaking and
loss of paint
 
flaking of sections of the ground layer - textile supports
 
flaking of sections of the ground layer - panels
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