How to create a perfect negative/positive

I purchased an exposure unit and so far I’ve been using rubylith to expose my plates. This works perfect! I have fine details in some artwork that I cant cut and decided to go to Kinko’s to get my designs printed on transparent paper/plastic. For some reason, my designs are not exposing! I can see outlines on the photo polymer plates, but cant rinse it out like I can my rubylith designs. Any idea where and how I can get the darkest prints made? Any help will be appreciated.

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