I'm making clear glass Christmas plates with fabric and MP. After the fabric has dried and MP sealer was applied, some of the fabric around the rim of the plate lacks MP to adhere to plate.
Normally if you want to add material to a glass object you need to use a special glue that will allow you to glue the material to the object. Now if the plate needs to have food you would normally only glue a part of the plate and cover this with the material. I find out that MP is not good to use to seal this. I normally seal mine with some clear varnish. Just keep in mind no matter what you will need to leave a section of the plate free from glue or material so that you can add food to the plate. I have made a lot of Christmas plates in the past and when I put the food on the plates I normally lay the food on wax paper if I have covered the full plate.
Beads that are glued to a glass should be sealed with an acrylic product, such as a matte medium to keep them in place. This is a page about gluing beads onto a wine glass.