Hi Leon
Is this actually Contravision or is it another manufacturers version of the product ? If it is Contravision do you know which laminate has been used ? We carry 3 different versions of laminate to use with the Contravision Performance range – a polyester, a cast and a polymeric version – each of these products would perform differently depending if the product is applied inside or out and if it is applied to flat glass or curved glass (such as the rear window of a cab)
As Dave has stated Contravision should always be applied dry especially if laminated (otherwise you just trap the water in the perforations)
A Sealit pen will not help edge seal a product construction such as this as the Sealit pen doesn’t give a thick enough edge seal, however a physical vinyl seal would help as an additional taped edging overlapping the Contravision and glass by 3 to 5mm ….. Unfortunately I don’t think this will help seal an already failing application as the adhesive will almost certainly be already damaged and water/dirt ingress will have effected the reverse of the laminate if it has lifted.
If you reply regarding the product used, application method and description of glass it was applied to (or add a photo of the faiure) I will see if I can help with a solution.