Warm a plate in the microwave until it’s hot to the touch, then, turn an empty isomalt half-sphere over and rub the flat edge of the isomalt shape onto the bottom of the plate until it just starts to melt.
Immediately place the slightly melted isomalt half on top of an isomalt half-bomb with a tea bag inside. The two sides of the tea bomb will seal together in just a moment or two when the isomalt cools.