It seems like you may have over-painted the sealant before it had fully cured, this can take a few days in some instances. Obviously, without seeing for myself, I'm guessing.
I would be tempted to leave it for a few days before trying to paint again since you'll get a thick build-up of paint that may show some cracking as it dries out.
In the meantime, you may want to get in touch with C-Tec as they are more likely to be able to guide you further.
technical@ct1.com