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Dave, I have used the Rustoleum 2X matte clear for sealing at least ten baits that I molded and had no curing issues with the silicone. I do about 3 light to med coats and it doesn't seem to fill in much detail. Again, I normally say stay away from Rustoleum products, but this one has worked for me. I let the matte clear dry and off gas a few days in the sun I have been using Smooth-On 29NV and Sprayway #946 Silicone release agent. I've always waited only and hour or two past the cure time to unmold the master. Hope you get'r figured out...

I would be best to seal with superglue, polyurethane or clear coat. I have molded all three with no issues. Clear coat is the best, but washes out the details.