− | It may take some time to learn how much pressure to apply to the handle when filling a mold. If you press too hard you will end up with lots of plastic flash on your finished piece as material will ooze out between the molds halves. If you don't press hard enough you could end up with an air pocket left in the mold. | + | It may take some time to learn how much pressure to apply to the handle when filling a mold. If you press too hard you will end up with lots of plastic flash on your finished piece as material will ooze out between the mold halves. If you don't press hard enough you could end up with an air pocket left in the mold. |