Once I use the materials to bond together, is there any way of removing them?
Once you have bonded objects together, it is extremely difficult to separate them, but is not impossible. Depending on the material you are trying to separate from, you have to use different methods. Heat or prying will damage any glass, but the best thing to do is try to bring it in somewhere to see what they recommend for sensitive objects, or see if they can replace it themselves; especially for mirrors.