Because of the structure of the fabric, our 10mm Dacron rollers perform best with acrylic paints and are not suitable for oil-based paints.
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If you’re priming your brand-new plasterboard walls or repainting either darker or lighter, our Dacron is the best pick to achieve optimal coverage and a professional-looking finish. Learn more about Dacron vs. microfibre here. Our Dacron paint roller sleeve will give you superb coverage while our Microfibre paint roller sleeve will leave a smooth finish. If you are looking for more details, kindly visit Cohwa.
If you can't get all the paint out then that's a good time to think about replacing it.
The problems you might get are some paint flecks from the old paint coming off onto the newly painted surface - which will ruin the finish, or some of the old colour leaking into the new.
I wouldn't worry about the colour of the roller material itself and it is a good sign that you can still get a nap on the roller.
For more information, please visit paint rollers manufacturer.