Yes, Micro ballons are for teh parties, were aonly a few of eh many guests show up!
No, Micro ballons are little baloons, about teh size of sand grains. They are used in epoxy for a few reasons, mainly to to thicken it up (so it dosen't run, can be used as a 'spakle') And the idea is that they take the space of epoxy, so you essencially save some weight / epoxy. Also allows for easier sanding, than jsut epoxy..