I am doing high gloss and sattin finish carbon fiber sheets using glass plates and aluminium sheets as negativ surface.
While the satin sheets just fall of the alumium after cureing the other ones stuck to the glass and have to be peeled off.

In the beginning, more renewed layers help, but at some point the point is reached that the sheets can only be removed with fine fine cracks in the surface because they are that strongly stuck to the glass plate.
The problem arises with increasing age of the release agent, however regardless of the specified shelf life?! The last bottle of 'Easy-Lease Chemical Release Agent' was ordered on March 22. Batch sticker says: ELRA-01  4173-19 
With this bottle the problem occurred from the beginning. Of course the surface was first cleaned with Easy-Lease Mould Cleaner.

I know glass as surface can be tricky but over the last 1 1/2 years I also got many remarkables results using 'xc110' in combination with the 'Easy-Lease Chemical Release Agent'.
But all sheets with cracks in the surface cannot be used for further production in my company, they have to be sorted out. This is extremely annoying in terms of the value of the wasted material and especially the work involved.
I hope you can help.

Ok so its as much an issue with glass as it is the release agent, as its working fine on aluminium. 

For pre-preg, I would expect release properties to fall away each time. Typically at least one recoat is needed on more aggressive processes like infusion or pre-preg. 

The bottle you originally mentioned was from 17/10/19 and the one in the post above is 21/12/18 so almost a year apart and your newer one is almost a year newer. 

I would certainly expect the newer one to perform better than the old batch - all things being equal.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant