Varnish Adhesion Problem After a Delayed Period

[Louis]

Hi All,

I am a newby to Print Planet, but hope that someone could please assist in trying to determine the cause of varnish peeling off after a delayed period in time(3 weeks plus) after the varnish was applied by silkscreen process. When the varnish was applied adhesion was checked and it stuck 100%. A couple of days later the boxes were die cut on a Bobst and still no adhesion problems. About another 2 weeks later the varnish starts peeling off in the scores and if you do a scratch test the varnish easily comes off. The job had a UV primer on and when varnished showed absolutely no problems.

Please help as this one has me completely baffled.

Thanks