Making NBR rubber tackier

[SometimesStumped]

I am trying to increase the tack of an NBR compound and so far am not have much success. Base polymer must be 32ACN or higher content and has a high duro (low oil content). The compound is dissolved in Toluol and MEK and then spread onto fabric. I have tried adding liquid NBR, hydrogenated rosin and pine tar and nothing seems to help. All are tacky when wet but loose their tackiness when they dry (and this is where I need it to remain tacky). Note: P-87 resin is added at the churn stage to make compound hard when cured.

Any thoughts on what additive might make this tackier?

 

[Metten]

a small amount of GRT chloroprene or polyisobutenes (oppanol) ?