Ultracote will not work with the windex method. It will not adhere. Only Ultracote plus would work, but that one is discontinued.
You can lay monokote over ultracote with no problem. after letting dry over night, the next morning just go over it with a iron or trim solvent if over open areas. I use a q-tip qith trim solvent and just go around the edges. Does not come loose.
For more info just do a search for "windex method". You should find plenty of info.