I mixed some urethane SS paint (Limco) yesterday morning, sprayed it on and everything was looking good. I am surprised now after 27 hours the surface is still sticky to touch and not cured enough to handle. The temps have been 70's to 80's the entire time, but the humidity was pretty high. Still something isn't right. Then I looked at my materials box and noticed I had picked up and used my bottle of SPI epoxy primer activator instead of the urethane activator. The mix was 4:1:1 1. Now I'm wondering if the chemical make up of the EP activator is different enough from urethane activator that the paint is never going to cure? Or, is there still hope to give it another day or two and it will continue to cure, (only much more slowly than planned)? 2. My EP activator bottle had been originally opened back in April, the product was re-sealed then and it looked normal. Does it go bad in a few months after opening? 3. Would putting it out in the direct sun help at all? 4. If I have created my on nightmare and end up having to get a bag of rags and take the paint off to start over, would it be best to use lacquer thinner or reducer? Thanks in advance.