To the person who had trouble with their plate flowers. I am so sorry! I have had some recently made ones fall apart lately too. I don't know if GE changed their formula for Silicone II for windows and doors (clear) or if I got a bad tube. You do have to look carefully at the date because once its outdated it won't work for plate flowers.
I'm going to be experimenting through the summer and will see what lasts over the winter and let you know what is working.